Laser in situ keratomileusis (LASIK) has proven to be
|
|
- Roberta Bryant
- 5 years ago
- Views:
Transcription
1 Autorefractometry after laser in situ keratomileusis Dimitrios S. Siganos, MD, PhD, Corina Popescu, MD, Nikolaos Bessis, DOpt, Georgios Papastergiou, MD Purpose: To correlate cycloplegic subjective refraction with cycloplegic autorefractometry in eyes that have had laser in situ keratomileusis (LASIK). Setting: Vlemma Eye Institute, Athens, Greece. Methods: Subjective refraction and autorefractometry under cycloplegia were performed in 73 eyes of 46 patients 1, 6, and 12 months after LASIK to correct myopia or myopic astigmatism. The preoperative subjective refraction and autorefractometry under cycloplegia in the same eyes served as controls. Results: A statistically significant difference between subjective refraction and autorefraction was found in the sphere and cylinder at all postoperative times. No statistically significant difference was found in the axis. There was no statistically significant difference in the control eyes. Conclusions: Automated refractometry in eyes that had had LASIK was reliable in the axis only. Retreatments after LASIK should always be based on subjective refraction. J Cataract Refract Surg 2003; 29: ASCRS and ESCRS Laser in situ keratomileusis (LASIK) has proven to be an effective treatment of low to moderate myopia, hyperopia, and astigmatism. 1 In this refractive technique, introduced in 1991, a thin stromal flap is created with a microkeratome; an excimer laser is then used to recontour the anterior surface of the underlying corneal stroma by removing stromal tissue with extremely high precision. 2 A new optical zone with a different refractive power is created, altering the patient s refractive error. The refractive change produced by a refractive procedure can be quantified by subjective methods such as manifest refraction and by objective methods such as keratometry or automated refraction. The corneal change determined by standard keratometry or in a more detailed way by computerized videokeratography has been used to estimate surgically induced Accepted for publication July 10, From Vlemma Eye Institute, Athens, Greece. None of the authors has a financial interest in any product mentioned. Reprint requests to D.S. Siganos, MD, PhD, Vlemma Eye Institute, 88 Patission Street, Athens 10434, Greece. admin@vlemma.com. refractive changes, including those that occur after photorefractive keratectomy (PRK). Although these values correlate well with manifest refraction values, their precision is low. 3 5 Automated refractometry is also used to quantify the refractive outcome of refractive procedures. Recent studies have evaluated the accuracy and precision of automated refractometry in predicting the refractive outcome of PRK. 6,7 The automated refractometer tends to underestimate the subjective outcome in the sphere and cylinder. In these studies, however, measurements were performed without cycloplegia, and the authors suggest that despite the automatic fogging included in the refractor, changes in accommodation could be a cause of the low reliability of the automated refractometer. In this study, we evaluated the correlation between manifest refraction and automated refractometry in 46 patients who had LASIK for myopia or myopic astigmatism. We performed subjective and automated refraction under cycloplegia, thus preventing changes in accommodation from influencing the refractive status of the eye ASCRS and ESCRS /03/$ see front matter Published by Elsevier Science Inc. doi: /s (02)
2 Patients and Methods Forty-six patients (73 eyes) who had LASIK for myopia and myopic astigmatism at our institute participated in the study. The mean age of the patients was years 9.92 (SD). The mean attempted spherical correction was diopters (D) and the mean attempted cylindrical correction, D. All patients were examined before LASIK and 1, 6, and 12 months after the procedure. The preoperative and postoperative visits included corneal topography, manifest and cycloplegic refractions, automated refraction under cycloplegia, intraocular pressure measurement, pupillometry (Colvard), corneal pachymetry, and a complete ophthalmoscopic examination. Cycloplegia was performed with cyclopentolate 1% (Cyclogyl ) and phenylephrine 5%. One drop of each medication was instilled 2 times with 5 minutes between drops. Cycloplegic refractometry and refraction were performed 30 to 40 minutes after the last drop. Cycloplegic refractometry was always performed before cycloplegic refraction. Subjective refraction was determined using a phorometer and autorefraction, using a Nidek AR600A autorefractor with a measurement range from 18.0 to 23.0 D in sphere and up to 8.0 D in cylinder. Laser in situ keratomileusis was performed under topical anesthesia using the Nidek 5000 excimer laser and the Flap- Maker microkeratome (Refractive Technologies). In all eyes, the optical zone was 0.5 mm greater than the scotopic pupil and the transition zone was 1.0 mm. Statistical analysis was performed using regression analysis and a paired t test (SPSS software, version 6.0). A P value less than 0.05 was considered statistically significant. Results Preoperatively, there was no statistically significant difference between cycloplegic refractometry and cycloplegic refraction in sphere, cylinder, or axis of astigmatism. One month after LASIK, the automated refractometry readings were statistically significantly different than the cycloplegic refraction measurements; automated refractometry tended to measure a more negative sphere and a higher cylinder (P.010 and P.008 for sphere and cylinder measurements, respectively) (Figures 1 and 2). The differences in the sphere and cylinder measurements were statistically significant at 6 (P.026, P.042) and 12 (P.045, P.017) months (Figures 1 and 2). The observed difference between the subjective refraction and automated refractometry did not change significantly over time. When the differences at the 3 postoperative times were compared, no statistically significant change was found. There was no statistically significant difference between the 2 methods in the axis of astigmatism before and after the procedure and at the 3 postoperative times. The preoperative myopia and astigmatism did not significantly affect the difference between cycloplegic refraction and automated refractometry at the 3 postoperative times. Discussion Automated refractometry is a rapid, convenient method to assess refractive error with and without cycloplegia. Numerous comparative evaluation studies have analyzed the improvement in accuracy, repeatability, and ease of operation of the various available instruments. 8,9 Recently developed handheld instruments have even been used for noncycloplegic screening in 3-year-old kindergarten children. 10 When automated refractometry is performed without cycloplegia, the results tend to be inaccurate, most likely because of the suboptimal control of accommodation, particularly in young patients. However, under cycloplegia, the sphere and cylinder results differ little from those obtained with retinoscopy. 11,12 Even under cycloplegic conditions, autorefractors tend to measure more negative or less positive refraction values than subjective refraction. 8 Previous studies have examined the accuracy of automated refractometry in quantifying the outcome of refractive procedures. Russell and coauthors 13 compared objective and subjective refractions after radial keratotomy and found a significant postoperative shift toward myopia in the automated refraction compared with the subjective refraction. Øyo-Szereni and coauthors 7 showed that automated refractometry readings tended to vary more from those obtained with subjective methods in PRK-treated eyes. Olsen and coauthors 6 also found that automated topography was superior to automated refractometry in predicting spherical equivalent subjective changes in refraction after PRK. In all studies, however, measurements were performed without cycloplegia and changes in accommodation could partly account for the inferior accuracy of automated refractometry after refractive surgery. In our study, we found that results obtained with automated refractometry in unoperated eyes agreed with those obtained with subjective refraction. However, 134 J CATARACT REFRACT SURG VOL 29, JANUARY 2003
3 Figure 1. (Siganos) Scattergrams showing the relationship between automated refraction (x-axis) and manifest refraction (y-axis) under cycloplegia for spherical power before LASIK and 3 times postoperatively. A preoperative. B 1 month post LASIK. C 6 months post LASIK. D 12 months post LASIK. postoperatively, automated refractometry was less accurate, tending toward a more negative sphere and a higher cylinder than the subjective measurements. This trend persisted throughout the 1-year follow-up. Automated refractometry was, however, accurate in determining the axis of astigmatism, although there were large standard deviations in measurements preoperatively and postoperatively. Finally, the amount of preoperative myopia and astigmatism and consequently the ablation depth did not appear to significantly affect the loss of accuracy exhibited by automated refractometry after LASIK. Numerous stromal and epithelial changes occur in the cornea after LASIK as a result of the wound-healing process, and all of them could influence autorefraction. Proteoglycans and newly formed collagen types III and VII are deposited in the stroma after a keratorefractive J CATARACT REFRACT SURG VOL 29, JANUARY
4 Figure 2. (Siganos) Scattergrams showing the relationship between automated refraction (x-axis) and manifest refraction (y-axis) under cycloplegia for cylindrical power before LASIK and 3 times postoperatively. A preoperative. B 1 month post LASIK. C 6 months post LASIK. D 12 months post LASIK. procedure. 14 Changes in epithelial thickness have also been described after LASIK. An increase in epithelial thickness occurs in the postoperative periods, peaking at 3 months and persisting for 12 months. 15 The corneal epithelium has a different refractive index than the stroma, and the observed change in its thickness could affect the cornea s dioptric power. 16 A change in the stromal refractive index possibly secondary to a change in stromal hydration during the healing period has also been proposed to explain the 136 J CATARACT REFRACT SURG VOL 29, JANUARY 2003
5 difference between changes in refraction and central ocular surface power after LASIK. 17 Stromal ablation alters the relationship of the anterior and posterior surfaces of the cornea, as well as the relative composition, and the thickness and curvature of the epithelium and the anterior and posterior stroma. These changes could affect the refractive properties of the cornea after LASIK. 3 The different refractive properties of the untreated and treated corneal areas and a steep junction zone between the ablated and unablated cornea could also affect automated refractometry. They should not have influenced automated refractometry readings in our cases as the ablation zone was always greater than the scotopic pupil and a wide transition zone was used in all eyes. In conclusion, automated refractometry was less accurate in eyes that had had LASIK. Although it is a valuable complement to subjective refraction, it should not replace it. Retreatments after LASIK should always be based on subjective refraction. References 1. Sugar A, Rapuano CJ, Culbertson WW, et al. Laser in situ keratomileusis for myopia and astigmatism: safety and efficacy; a report by the American Academy of Ophthalmology. Ophthalmology 2002; 109: Pallikaris IG, Papatzanaki ME, Siganos DS, Tsilimbaris MK. A corneal flap technique for laser in situ keratomileusis; human studies. Arch Ophthalmol 1991; 109: Hugger P, Kohnen T, La Rosa FA, et al. Comparison of changes in manifest refraction and corneal power after photorefractive keratectomy. Am J Ophthalmol 2000; 129: Smith RJ, Chang W-K, Maloney RK. The prediction of surgically induced refractive change from corneal topography. Am J Ophthalmol 1998; 125: Nguyen NX, Langenbucher A, Viestenz A, et al. Correlation among refractive, keratometric and topographic astigmatism after myopic photorefractive keratectomy. Graefes Arch Clin Exp Ophthalmol 2000; 238: Olsen H, Hjortdal JØ, Ehlers N. Comparison of objective methods for quantifying the refractive effect of photo-astigmatic refractive keratectomy using the MEL-60 excimer laser. Acta Ophthalmol Scand 1997; 75: Øyo-Szerenyi KD, Wienecke L, Businger U, Schipper I. Autorefraction/autokeratometry and subjective refraction in untreated and photorefractive keratectomytreated eyes. Arch Ophthalmol 1997; 115: Kinge B, Midelfart A, Jacobsen G. Clinical evaluation of the Allergan Humphrey 500 autorefractor and the Nidek AR-1000 autorefractor. Br J Ophthalmol 1996; 80: Wong EK Jr, Patella VM, Pratt MV, et al. Clinical evaluation of the Humphrey automatic refractor. Arch Ophthalmol 1994; 102: Cordonnier M, Dramaix M. Screening for refractive errors in children: accuracy of the handheld refractor Retinomax to screen for astigmatism. Br J Ophthalmol 1999; 83: Berman M, Nelson P, Caden B. Objective refraction: comparison of retinoscopy and automated techniques. Am J Optom Physiol Opt 1984; 61: Salvesen S, Køhler M. Automated refraction; a comparative study of automated refraction with the Nidek AR autorefractor and retinoscopy. Acta Ophthalmol 1991; 69: Russell GE, Bergmanson JPG, Barbeito R, Cross WD. Differences between objective and subjective refractions after radial keratometry. Refract Corneal Surg 1992; 8: Assil KK, Quantock AJ. Wound healing in response to keratorefractive surgery. Surv Ophthalmol 1993; 38: Spadea L, Fasciani R, Necozione S, Balestrazzi E. Role of the corneal epithelium in refractive changes following laser in situ keratomileusis for high myopia. J Refract Surg 2000; 16: Patel S, Marshall J, Fitzke FW III. Refractive index of the human corneal epithelium and stroma. J Refract Surg 1995; 11: Patel S, Alió JL, Pérez-Santonja JJ. A model to explain the difference between changes in refraction and central ocular surface power after laser in situ keratomileusis. J Refract Surg 2000; 16: J CATARACT REFRACT SURG VOL 29, JANUARY
Recent concerns regarding the depth of tissue ablation with
Volume Estimation of Excimer Laser Tissue Ablation for Correction of Spherical Myopia and Hyperopia Damien Gatinel, 1 Thanh Hoang-Xuan, 1 and Dimitri T. Azar 1,2 PURPOSE. To determine the theoretical volumes
More informationReliability of Cycloplegic Autorefractor Measurements to determine Spherical and Astigmatic Refractive Errors in Young Children
ISPUB.COM The Internet Journal of Ophthalmology and Visual Science Volume 6 Number 1 Reliability of Cycloplegic Autorefractor Measurements to determine Spherical and Astigmatic Refractive Errors in Young
More informationThe two currently accepted methods for correcting
New Technique Therapeutic Alloplastic Laser in situ Keratomileusis for Myopia Arturo Maldonado-Bas, MD; Ruben Pulido-Garcia, MD ABSTRACT BACKGROUND: A new technique, therapeutic alloplastic laser in situ
More informationSummary Recommendations for Keratorefractive Laser Surgery June 2013
Summary Recommendations for Keratorefractive Laser Surgery June 2013 Background Laser assisted in-situ keratomileusis (LASIK) surgery is the most commonly performed keratorefractive surgery; altering the
More informationFor approximately two decades photorefractive keratectomy. Seven-Year Changes in Corneal Power and Aberrations after PRK or LASIK.
Cornea Seven-Year Changes in Corneal Power and Aberrations after PRK or LASIK Anders Ivarsen and Jesper Hjortdal PURPOSE. To examine long-term changes in corneal power and aberrations in myopic patients
More informationComparison of Corneal Power and Intraocular Lens Power Calculation Methods after LASIK for Myopia
Comparison of Corneal Power and Intraocular Lens Power Calculation Methods after LASIK for Myopia Seyed Mohammad Reza Taheri, MD 1 Azita Kheiltash, MD, MPH 2 Hassan Hashemi, MD 1,3 Abstract Purpose: To
More informationCataract Surgery in the Patient with a History of LASIK or PRK
Cataract Surgery in the Patient with a History of LASIK or PRK #56996-RS April 2018 Sebastian Lesniak, MD Matossian Eye Associates None Disclosures Bio Matossian Eye Associates, Hopewell NJ, 7/2015 Present
More informationautorefractor and the Nidek AR
British Journal of Ophthalmology 1996; 8: 35-39 The University of Trondheim, Faculty of Medicine, Trondheim, Norway Department of Ophthalmology B Kinge Midelfart Department of Community Medicine and General
More informationThe Comparison of Central and Mean True-Net Power (Pentacam) in Calculating IOL-Power After Refractive Surgery
접수번호 :08-024 Korean Journal of Ophthalmology 2009;23:1-5 ISSN : 1011-8942 DOI : 10.3341/kjo.2009.23.1.1 The Comparison of Central and Mean True-Net Power (Pentacam) in Calculating IOL-Power After Refractive
More informationThe pinnacle of refractive performance.
The pinnacle of refractive performance. WaveLight REFRACTIVE PORTFOLIO Advancing REFRACTIVE SURGERY Contoura Vision sets a new standard in LASIK outcomes More than 98% of patients would choose it again.
More informationFour-year Postoperative Results of the US ALLEGRETTO WAVE Clinical Trial for the Treatment of Hyperopia
Four-year Postoperative Results of the US ALLEGRETTO WAVE Clinical Trial for the Treatment of Hyperopia Guy M. Kezirian, MD, FACS; Charles R. Moore, MD, FICS; Karl G. Stonecipher, MD; SurgiVision Consultants
More informationIOL Master. Photorefractive keratectomy
89/11/3 : 89/9/3 : 1389 /119 / IOL Master * Photorefractive keratectomy 3 2 1 2 4 Photorefractive keratectomy(prk) (IOL) :. IoL-Master.. (clinical trial) :. 30 20 35.. PRK. IOL Master ( GM300,china) IOL.
More informationDescription of iatrogenic corneal ectasia in patients without traditional risk factors
ARTICLE Description of iatrogenic corneal ectasia in patients without traditional risk factors Julio Ortega-Usobiaga, MD, PhD 1 ; Rosario Cobo-Soriano, MD, PhD 1 ; Fernando Llovet-Osuna, MD, PhD 1 ; Stephan
More informationManagement of Unpredictable Post-PRK Corneal Ectasia with Intacs Implantation
Management of Unpredictable Post-PRK Corneal Ectasia with Intacs Implantation Mohammad Naser Hashemian, MD 1 Mahdi AliZadeh, MD 2 Hassan Hashemi, MD 1,3 Firoozeh Rahimi, MD 4 Abstract Purpose: To present
More informationCentral and Peripheral Changes in Anterior Corneal Topography after Orthokeratology and Laser in situ Keratomileusis
Central and Peripheral Changes in Anterior Corneal Topography after Orthokeratology and Laser in situ Keratomileusis Han-Yin Sun 1, 2, 3, Hsiu-Wan Yang 4, I-Tsung Wu 4, Jung-Kai Tseng 2, 3 1, 5* and Shun-Fa
More informationCorneal Power Measurements Using Scheimpflug Imaging in Eyes With Prior Corneal Refractive Surgery
Corneal Power Measurements Using Scheimpflug Imaging in Eyes With Prior Corneal Refractive Surgery Jack T. Holladay, MD, MSEE, FACS; Warren E. Hill, MD, FACS; Andreas Steinmueller, MSc ABSTRACT PURPOSE:
More informationAbdel Rahman ElSebaey, MD, PhD.
Surface Ablation Refractive Surgery Abdel Rahman ElSebaey, MD, PhD. Menoufia University History Correction of optical defects of human eye started 1200 AD. Spherical error corrected by spectacle on 13
More informationPHOTOREFRACTIVE KERATECTOMY (PRK) PATIENT INFORMATION BOOKLET
616.365.5775 www.keillasik.com PHOTOREFRACTIVE KERATECTOMY (PRK) PATIENT INFORMATION BOOKLET Please read this entire booklet. Discuss its contents with your doctor so that questions are answered to your
More informationAuthor s Affiliation. Original Article. Visual outcomes after LASIK (laser-assisted in-situ keratomileusis) for various refractive errors.
Original Article Visual outcomes after LASIK (laser-assisted in-situ keratomileusis) for various refractive errors. Author s Affiliation Sobia Tufail Imran Ahmad Asad Aslam Khan Correspondence Author:
More informationComparison of Corneal and Anterior Chamber Parameters following Myopic laser in situ keratomileusis and photorefractive keratectomy by
Comparison of Corneal and Anterior Chamber Parameters following Myopic laser in situ keratomileusis and photorefractive keratectomy by Pentacam as A New Imaging Technique Mohammad Ali Zare, MD 1 Hassan
More information펨토초레이저와미세각막절삭기를이용한근시교정수술에서임상성적비교
펨토초레이저와미세각막절삭기를이용한근시교정수술에서임상성적비교 4 Table. Summary of data about patient who had LASIK operation using second laser and keratome Age (years) Male:Female (eyes) Pre-op. IOP (mmhg) Pre-op SE * (D) Pre-op
More informationConductive keratoplasty (CK) (Refractec, Inc.) is a
Conductive keratoplasty to correct residual hyperopia after corneal surgery Ian F. Comaish, FRCOphth, Michael A. Lawless, FRACO, FRCOphth Conductive keratoplasty (CK) is an electrical-current-based technique
More informationRefractive error is one of the most common causes of
Original Article A comparative study between the results of streak retinoscope and auto refractometer Dharmendra Das 1 Abstract Introduction: To compare the results of subjective refraction between autorefractometer
More informationSimultaneous Topography-guided Surface Ablation with Collagen Cross-linking for Keratoconus
IJKECD Case series Simultaneous Topography-guided Surface Ablation with Collagen 10.5005/jp-journals-10025-1124 Cross-linking for Keratoconus Simultaneous Topography-guided Surface Ablation with Collagen
More informationRefractive Surgery Dilemma
Refractive Surgery Dilemma Section Editor: lireza aradaran-rafii, MD CSE PRESENTTION 33-year-old man seeking refractive surgery presented with refractive error of -1.75-4.0 20 in the right and -0.75-2.5
More informationContoura TM Vision Correction
Contoura TM Vision Correction Fernando Faria Correia, Financial Disclosures: Alcon/Wavelight Cairo (Egypt) 26/01/2018 Topography-guided ablations Topography guided ablations Evolution from complicated
More informationLASIK for 6.00 to D of Myopia With up to 3.00 D of Cylinder Using the ALLEGRETTO WAVE: 3- and 6-month Results With the 200- and 400-Hz Platforms
LASIK for 6.00 to 12.00 D of Myopia With up to 3.00 D of Cylinder Using the ALLEGRETTO WAVE: 3- and 6-month Results With the 200- and 400-Hz Platforms Karl G. Stonecipher, MD; Guy M. Kezirian, MD; Megan
More informationOriginal Article High myopia as a risk factor for post-lasik ectasia: a case report
Original Article High myopia as a risk factor for post-lasik ectasia: a case report Mona Harissi-Dagher, MD, a,b Sonja A. F. Frimmel, c and Samir Melki, MD, PhD a,d Author affiliations: a Massachusetts
More informationScreening for refractive errors in children: accuracy of the hand held refractor Retinomax to screen for astigmatism
Br J Ophthalmol 1999;83:17 161 17 Ophthalmology Department, Hôpital Universitaire Erasme, Université Libre de Bruxelles, Belgium M Cordonnier Department of Biostatistics of the School of Public Health,
More informationSCHWIND CAM Perfect Planning wide range of applications
SCHWIND CAM Perfect Planning wide range of applications ORK-CAM PresbyMAX PTK-CAM 2 SCHWIND CAM the system solution The modular design of the SCHWIND CAM offers customised treatment planning for a uniquely
More informationPhotorefractive Keratectomy as A Retreatment of Residual Myopia after Previous Laser in Situ Keratomileusis
Photorefractive Keratectomy as A Retreatment of Residual Myopia after Previous Laser in Situ Keratomileusis Alireza Ashtari, MD 1 Hassan Razmju, MD 2 Amin Masjedi, MD 3 Alireza Zandi, MD 1 Mehdi Tavakoli,
More informationL. Spadea, R. Ferrante, F. Romani, A. Di Gregorio
University of L Aquila Eye Clinic Head: Prof. Leopoldo Spadea ULTRAFAST EXCIMER LASER FOR TRANS-EPITHELIAL CUSTOMIZED PHOTOREFRACTIVE SURGERIES: CLINICAL RESULTS WITH 6 MONTHS FOLLOW UP L. Spadea, R. Ferrante,
More informationNature and Science 2017;15(11) Mohamed Elmoddather. MD
Outcome of PRK in Management of Post LISIK Residual Myopia and Myopic Astigmatism Mohamed Elmoddather. MD Ophthalmology Faculty of Medicine, Al-Azhar University, Assuit, Egypt shahdmsaleh@hotmail.com Abstract:
More informationCLINICAL SCIENCES. Management of Post-LASIK Corneal Ectasia With Intacs Inserts
Management of Post-LASIK Corneal Ectasia With Intacs Inserts One-Year Results CLINICAL SCIENCES George D. Kymionis, MD, PhD; Charalambos S. Siganos, MD, PhD; George Kounis, BSc; Nikolaos Astyrakakis, OD;
More informationCATARACT SURGERY AFTER RADIAL KERATOTOMY
AFTER RADIAL KERATOTOMY How to avoid disappointment. BY BERNARD MATHYS, MD CATARACT SURGERY Radial keratotomy (RK; Figure 1) was a popular refractive surgical procedure to correct myopia in the 1970s and
More informationOcular Rigidity Evaluation After Photorefractive Keratectomy: An Experimental Study
BIOMECHANICS Ocular Rigidity Evaluation After Photorefractive Keratectomy: An Experimental Study George D. Kymionis, MD, PhD; Vasilios F. Diakonis, MD; George Kounis, BSc; Spyridon Charisis, MD; Dimitrios
More informationLaser in situ keratomileusis (LASIK) has
Changes in Intraocular Pressure After Laser in situ Keratomileusis Khaled M. Rashad, MD; Ahmed A. Bahnassy, MSc, PhD ABSTRACT PURPOSE: To evaluate changes in intraocular pressure (IOP) measurements by
More informationComparison between Pascal dynamic contour tonometer and Goldmann applanation tonometer after different types of refractive surgery
DOI 10.1007/s00417-010-1431-9 REFRACTIVE SURGERY Comparison between Pascal dynamic contour tonometer and Goldmann applanation tonometer after different types of refractive surgery Antonios P. Aristeidou
More informationPersonal data. Curriculum Vitae. Experience. Date of birth 18 December 1969
1 Curriculum Vitae Dr. Sophia I. Panagopoulou University of Crete Medical School, IVO 71003 Heraklion Greece Phone: +302810394645 FAX: +302810394653 e-mail: spanagop@med.uoc.gr Personal data Date of birth
More informationEfficacy of Photorefractive Keratectomy for Military Pilot Recruitment in an Asian Air Force
Efficacy of Photorefractive Keratectomy for Military Pilot Recruitment in an Asian Air Force Brian See, Gerard Nah, Wee Hoe Gan, Robin Low AsMA Annual Scientific Meeting 2013 Chicago, IL, USA Disclosure
More informationEffect of Refractive Surgery on Corneal Properties and Visual Acuity
2013 DAZCo, Danesh Afarand Zistagen Co., IRAN ISSN: 1735-0344 Quarterly of the Horizon of Medical Sciences 2013; 19(1): 11-15 Effect of Refractive Surgery on Corneal Properties and Visual Acuity A R T
More informationInduced Secondary Astigmatism and Horizontal Coma after LASIK for Mixed Astigmatism
Induced Secondary Astigmatism and Horizontal Coma after LASIK for Mixed Astigmatism S-Farzad Mohammadi, MD 1 Maryam Tahvildari, MD 2 Tahereh Abdolahinia, BS 3 Abstract Purpose: To describe a distinctive
More informationKeratoconus Clinic. Optometric Co-management Opportunities
Keratoconus Clinic Optometric Co-management Opportunities The Bochner Eye Institute established the first Keratoconus Clinic in Canada in 2008. The consultation and advanced imaging are OHIP covered. All
More informationEffect of refractive surgery on corneal properties and visual acuity
Quarterly of the Horizon of Medical Sciences Vol. 19, No. 1, Spr 2013 Pages: 11-15 Effect of refractive surgery on corneal properties and visual acuity Mahjoub M.* BSc, Momeni Moghadam H. 1 PhD, Rohani
More informationClinical Outcomes of an Optimized Prolate Ablation Procedure for Correcting Residual Refractive Errors Following Laser Surgery
pissn: 111-8942 eissn: 292-9382 Korean J Ophthalmol 217;31(1):16-24 ht tps://doi.org/1.3341/k jo.217.31.1.16 Original Article Clinical Outcomes of an Optimized Prolate Ablation Procedure for Correcting
More informationWavefront-Optimized Technology in Hyperopic Correction Stability Using Different Optical Zones
Med. J. Cairo Univ., Vol. 78, No. 1, December 559-563, 2010 www.medicaljournalofcairouniversity.com Wavefront-Optimized Technology in Hyperopic Correction Stability Using Different Optical Zones ADNAN
More informationSMILE A Solution to Those who go in Harm s Way
SMILE A Solution to Those who go in Harm s Way Steven Schallhorn, M.D. Chief Medical Officer November 12, 2016 Operational Basis for Involvement Commander of Naval Special Warfare identified deficiencies
More informationNumber 80. Laser Eye Surgery in Myopia. Date of decision October 2017 Date of review October 2020 GUIDANCE
Excluded: Procedure not routinely funded Bedfordshire, Hertfordshire, West Essex, Luton and Milton Keynes Priorities Forum statement - adapted for Bedfordshire CCG Number 80 Subject Date of decision October
More informationComparison of Corneal Shape Changes and Aberrations Induced By FS-LASIK and SMILE for Myopia
ORIGINAL ARTICLE Comparison of Corneal Shape Changes and Aberrations Induced By FS-LASIK and SMILE for Myopia Anders Gyldenkerne, MS; Anders Ivarsen, MD, PhD; Jesper Ø. Hjortdal, MD, PhD ABSTRACT PURPOSE:
More informationThe Egyptian Journal of Hospital Medicine (October 2018) Vol. 73 (9), Page
The Egyptian Journal of Hospital Medicine (October 2018) Vol. 73 (9), Page 7580-7586 Outcome of PRK in Management of Post LISIK Residual Myopia and Myopic Astigmatism Department of Ophthalmology, Faculty
More informationThe Egyptian Journal of Hospital Medicine (October 2018) Vol. 73 (9), Page
The Egyptian Journal of Hospital Medicine (October 2018) Vol. 73 (9), Page 7574-7579 Biomechanical Corneal Changes Post LASIK with Mechanical Microkeratome Flap versus Femtosecond Flap Department of Ophthalmology,
More informationOutcomes of NIDEK Optical Path Difference Custom Ablation Treatments (OPDCAT) for Myopia With or Without Astigmatism
Outcomes of NIDEK Optical Path Difference Custom Ablation Treatments (OPDCAT) for Myopia With or Without Astigmatism Shihao Chen, MD, OD, MS; Yibo Wang, MD; Qinmei Wang, MD ABSTRACT PURPOSE: To report
More informationWhat Makes a Good. Refractive Procedures
What Makes a Good Refractive Procedure? Surgeons discuss their preferred treatments for various refractive errors. By Frik J. Potgieter, MB ChB (Stell), FCS (SA), MMed (Pret), FRCS (Edin); David T.C. Lin,
More informationArtisan Phakic Intraocular Lens for the Correction of Severe Myopic Astigmatism
Artisan Phakic Intraocular Lens for the Correction of Severe Myopic Astigmatism Hassan Hashemi, MD 1,2 Mansour Taherzadeh, MD 1 Mehdi Khabazkhoob, MSc 1 Abstract Purpose: To determine and evaluate the
More informationClinical Outcomes after Topography-based Corneal Laser Surgery with the. WaveLight Oculyzer and Topolyzer Platforms
1 Clinical Outcomes after Topography-based Corneal Laser Surgery with the WaveLight Oculyzer and Topolyzer Platforms By Arthur B. Cummings, M.D. 1 and Nadia Mascharka, MSc 2 Corresponding Author: Arthur
More informationSatisfaction of 13,655 Patients With Laser Vision Correction at 1 Month After Surgery
Satisfaction of 13,655 Patients With Laser Vision Correction at 1 Month After Surgery Mitchell C. Brown, OD; Steven C. Schallhorn, MD; Keith A. Hettinger, MS, MBA; Stephanie E. Malady, BS ABSTRACT PURPOSE:
More informationCorrespondence should be addressed to Xingtao Zhou;
Hindawi Ophthalmology Volume 2017, Article ID 9659481, 8 pages https://doi.org/10.1155/2017/9659481 Clinical Study Comparison of Corneal Power and Astigmatism between Simulated Keratometry, True Net Power,
More informationResearch Article Risk Assessment for Corneal Ectasia following Photorefractive Keratectomy
Hindawi Journal of Ophthalmology Volume 17, Article ID 24348, pages https://doi.org/.1155/17/24348 Research Article Risk Assessment for Corneal Ectasia following Photorefractive Keratectomy Nir Sorkin,
More informationInfluence of fogging lenses and cycloplegia on open-field automatic refraction
Influence of fogging lenses and cycloplegia on open-field automatic refraction Queirós A 1, J. González-Méijome 1, Jorge J. 1 1 Department of Physics (Optometry), School of Sciences, University of Minho,
More informationWavefront-optimized Versus Wavefrontguided LASIK for Myopic Astigmatism With the ALLEGRETTO WAVE: Three-month Results of a Prospective FDA Trial
Wavefront-optimized Versus Wavefrontguided LASIK for Myopic Astigmatism With the ALLEGRETTO WAVE: Three-month Results of a Prospective FDA Trial Karl G. Stonecipher, MD; Guy M. Kezirian, MD, FACS ABSTRACT
More informationWenjing Wu and Yan Wang. 1. Introduction. 2. Materials and Methods
Journal of Ophthalmology Volume 2015, Article ID 758196, 10 pages http://dx.doi.org/10.1155/2015/758196 Research Article The Correlation Analysis between Corneal Biomechanical Properties and the Surgically
More information2/7/18. Disclosures: Laser K s: Keratectomy to Keratomileusis with a SMILE. Who Patients Are Listening to
Disclosures: Laser K s: Keratectomy to Keratomileusis with a SMILE Glaukos Equinox Alcon Mitch Ibach OD, FAAO Vance Thompson Vision Who Patients Are Listening to Optometrist 36% People who've had surgery
More informationLASIK has been the primary type of corneal refractive surgery
Cornea Higher-Order Aberrations of Anterior and Posterior Corneal Surfaces in Patients With Keratectasia After LASIK Naoyuki Maeda, 1 Tomoya Nakagawa, 1 Ryo Kosaki, 1 Shizuka Koh, 1 Makoto Saika, 2 Takashi
More informationDifferences in nasal and temporal responses of the cornea after photorefractive keratectomy
Differences in nasal and temporal responses of the cornea after photorefractive keratectomy Sebastiano Serrao, MD, PhD, Giuseppe Lombardo, Eng, PhD, Marco Lombardo, MD Purpose: To examine the differences
More informationOne-year outcomes of small-incision lenticule extraction (SMILE): mild to moderate myopia vs. high myopia
Kim et al. BMC Ophthalmology (2015) 15:59 DOI 10.1186/s12886-015-0051-x RESEARCH ARTICLE Open Access One-year outcomes of small-incision lenticule extraction (SMILE): mild to moderate myopia vs. high myopia
More informationIntroduction. Anders Vestergaard, 1,2 Anders Ivarsen, 1 Sven Asp 1 and Jesper Ø. Hjortdal 1. Acta Ophthalmologica 2013
Femtosecond (FS) laser vision correction procedure for moderate to high myopia: a prospective study of ReLEx Ò flex and comparison with a retrospective study of FS-laser in situ keratomileusis Anders Vestergaard,
More informationPhotochemical corneal collagen cross-linkage using riboflavin and ultraviolet A for keratoconus and keratectasia
Photochemical corneal collagen cross-linkage using riboflavin and ultraviolet A for keratoconus and keratectasia Issued: September 2013 guidance.nice.org.uk/ipg466 NICE has accredited the process used
More informationResearch Article Effect of Mitomycin C on Myopic versus Astigmatic Photorefractive Keratectomy
Hindawi Ophthalmology Volume 2017, Article ID 2841408, 5 pages https://doi.org/10.1155/2017/2841408 Research Article Effect of Mitomycin C on Myopic versus Astigmatic Photorefractive Keratectomy Ashwag
More informationComparison between Pentacam HR and Orbscan II after Hyperopic Photorefractive Keratectomy
Original Article Comparison between Pentacam HR and Orbscan II after Hyperopic Photorefractive Keratectomy Mahmoud Jabbarvand 1, MD; Farshad Askarizadeh 2, PhD; Mohamad Reza Sedaghat 3, MD Hadi Ghadimi
More informationInterventional procedures guidance Published: 25 September 2013 nice.org.uk/guidance/ipg466
Photochemical corneal collagen cross-linkage using riboflavin and ultraviolet A for keratoconus and keratectasia Interventional procedures guidance Published: 25 September 2013 nice.org.uk/guidance/ipg466
More informationUpdated practical intraocular lens power calculation after refractive surgery
REVIEW C URRENT OPINION Updated practical intraocular lens power calculation after refractive surgery Gowtham Jonna and Prabjot Channa Purpose of review Since its introduction in the 1980s, more than 40
More informationCLINICAL STUDY. BJ Choi 1, YM Park 2 and JS Lee 2
(2015) 29, 356 362 & 2015 Macmillan Publishers Limited All rights reserved 0950-222X/15 www.nature.com/eye CLINICAL STUDY Clinical outcomes between optical path difference custom aspheric treatment and
More informationPOST-LASIK ECTASIA MANAGEMENT
POST-LASIK ECTASIA MANAGEMENT A. John Kanellopoulos MD 1,2 1: Laservision.gr Clinical & Research Eye Institute, Athens, Greece 2: NYU Medical School Department of Ophthalmology, NY, NY Financial interests:
More informationThin flap laser in situ keratomileusis: Analysis of contrast sensitivity, visual, and refractive outcomes
Thin flap laser in situ keratomileusis: Analysis of contrast sensitivity, visual, and refractive outcomes Rosario Cobo-Soriano, MD, PhD, Miguel A. Calvo, MD, Jaime Beltrán, MD, Fernando L. Llovet, MD,
More informationArtiflex Toric Phakic Intraocular Lens Implantation in Congenital Nystagmus
273 This is an Open Access article licensed under the terms of the Creative Commons Attribution- NonCommercial-NoDerivs 3.0 License (www.karger.com/oa-license), applicable to the online version of the
More informationLASIK Flap Thickness Accuracy after Using Mechanical Microkeratome
Med. J. Cairo Univ., Vol. 84, No. 1, June: 733-737, 2016 www.medicaljournalofcairouniversity.net LASIK Flap Thickness Accuracy after Using Mechanical Microkeratome AYA H. FARAG, M.Sc.; RANIA M. SOBHY,
More informationKNOW THE OPTIONS. Discover how the latest advances in vision correction can improve your sight.
KNOW THE OPTIONS. LASIK VISIAN ICL PRK Discover how the latest advances in vision correction can improve your sight. Today, you can choose from several choices of permanent vision correction procedures
More informationWhite Paper. Topography-Guided Laser Assisted In-Situ Keratomileusis vs Small- Incision Lenticule Extraction Refractive Surgery
White Paper Topography-Guided Laser Assisted In-Situ Keratomileusis vs Small- Incision Lenticule Extraction Refractive Surgery A Summary of Clinical Outcomes Andrea Petznick, Diplom-AO (FH), PhD Alcon
More informationFlap characteristics, predictability, and safety of the Ziemer FEMTO LDV femtosecond laser with the disposable suction ring for LASIK
(2014) 28, 66 71 & 2014 Macmillan Publishers Limited All rights reserved 0950-222X/14 www.nature.com/eye CLINICAL STUDY Flap characteristics, predictability, and safety of the Ziemer FEMTO LDV femtosecond
More informationA procedure for Present and Future
A procedure for Present and Future MOSTAFA M. SALAH MD PROFESSOR Head of Refractive Unit RESEARCH INSTITUTE OF OPHTHALMOGY CAIRO -EGYPT 1 THIN FLAP LASIK DEF. Creation of Intended regular thin flap less
More informationWhite Paper. Topography-Guided Laser Assisted In-Situ Keratomileusis vs Small- Incision Lenticule Extraction Refractive Surgery
White Paper Topography-Guided Laser Assisted In-Situ Keratomileusis vs Small- Incision Lenticule Extraction Refractive Surgery A Summary of Clinical Outcomes Andrea Petznick, Diplom-AO (FH), PhD Alcon
More informationEffect of treatment zone diameter on the clinical results of femtosecond laser-assisted in situ
Clinical and Experimental Vision and Eye Research Journal (2018), 1, 1 6 ORIGINAL ARTICLE Effect of treatment zone diameter on the clinical results of femtosecond laser-assisted in situ keratomileusis
More informationLaser in Situ Keratomileusis versus Laser Assisted Subepithelial Keratectomy for the Correction of Low to Moderate Myopia and Astigmatism
Laser in Situ Keratomileusis versus Laser Assisted Subepithelial Keratectomy for the Correction of Low to Moderate Myopia and Astigmatism Seyed Javad Hashemian, MD 1 Hossein Aghaei, MD 2 Alireza Foroutan,
More informationLouis Probst. Commitment to Optometry. Cycloplegic Exam. Steroid free PRK. LASIK Enhancements made Ridiculously Simple 8/18/2017
Louis Probst LASIK Enhancements made Ridiculously Simple Louis E. Probst MD National Medical Director, TLC Chief Surgeon, Central Midwest, USA TLC surgeon 22 years 7 books, 80 chapters, 50 papers, 11 instruments
More informationDifferences in contrast sensitivity between pre- and post-operative LASIK patients
Pacific University CommonKnowledge College of Optometry Theses, Dissertations and Capstone Projects 5-1-2000 Differences in contrast sensitivity between pre- and post-operative LASIK patients Raschel Zeschuk
More informationAutomated lamellar keratoplasty for the correction of hyperopia
Automated lamellar keratoplasty for the correction of hyperopia Guy M. Kezirian, M.D., Charles M. Gremillion, M.D. ABSTRACT Hyperopic automated lamellar keratoplasty (H-ALK) is a refractive procedure that
More informationTen-year Follow-up of Laser In Situ Keratomileusis for High Myopia
Ten-year Follow-up of Laser In Situ Keratomileusis for High Myopia JORGE L. ALIÓ, ORKUN MUFTUOGLU, DOLORES ORTIZ, JUAN JOSE PÉREZ-SANTONJA, ALBERTO ARTOLA, MARIA JOSE AYALA, MARIA JOSE GARCIA, AND GRACIA
More informationORIGINAL ARTICLE COMPARISON OF SUBJECTIVE AND OBJECTIVE REFRACTION IN CHILDREN WITH AND WITHOUT USING CYCLOPLEGICS
ORIGINAL ARTICLE COMPARISON OF SUBJECTIVE AND OBJECTIVE REFRACTION IN CHILDREN WITH AND WITHOUT USING CYCLOPLEGICS Anita Ganger 1, Saroj Bala 2, Inderjit Kaur 3, Prempal Kaur 4, Satpal 3 (e) ISSN Online:
More informationCycloplegic influence on the accuracy of autorefractometer in myopic and hyperopic children
Nepal J Ophthalmol 25;7(4): 48-58 Original article Cycloplegic influence on the accuracy of autorefractometer in myopic and hyperopic children SK Prabhakar, Prathibha KS, Pooja A Angadhi, Anuj Kumar Singhal,
More informationCauses and Prevention of Diplopia After Refractive Surgery
Causes and Prevention of Diplopia After Refractive Surgery Burton J. Kushner, M.D. ABSTRACT Background and Purpose: To describe the decompensation of strabismus or the occurrence of persistent diplopia
More informationChanges in the anterior cornea during the early stages of severe myopia prior to and following LASIK, as detected by confocal microscopy
EXPERIMENTAL AND THERAPEUTIC MEDICINE 14: 2869-2874, 2017 Changes in the anterior cornea during the early stages of severe myopia prior to and following LASIK, as detected by confocal microscopy JINRONG
More informationResearch Article Effect of Flat Cornea on Visual Outcome after LASIK
Hindawi Publishing Corporation Journal of Ophthalmology Volume 2015, Article ID 794854, 7 pages http://dx.doi.org/10.1155/2015/794854 Research Article Effect of Flat Cornea on Visual Outcome after LASIK
More informationThe initial clinical application of the excimer
Laser in Situ Keratomileusis for Myopia and Hyperopia Using the Lasersight 200 Laser in 300 Consecutive Eyes Victor E. Reviglio, MD; Erica L. Bossana, MD; José D. Luna, MD; Juan C. Muiño, MD; Claudio P.
More informationExamination of the cornea by very highfrequency
Epithelial and Stromal Changes Induced by Intacs Examined by Three-dimensional Very Highfrequency Digital Ultrasound Dan Z. Reinstein, MD, MA(Cantab), FRCSC; Sabong Srivannaboon, MD; Simon P. Holland,
More informationComparison of Newer IOL Power Calculation Methods for Eyes With Previous Radial Keratotomy PATIENTS AND METHODS. Patients
Special Issue Comparison of Newer IOL Power Calculation Methods for Eyes With Previous Radial Keratotomy Jack X. Ma, 1 Maolong Tang, 2 Li Wang, 3 Mitchell P. Weikert, 3 David Huang, 2 and Douglas D. Koch
More informationThe early detection of keratoconus is essential
REFRCTIVE SURGERY Identifying Keratoconus Suspects With Wavefront Preoperative wavefront analysis may help surgeons prevent erratic LSIK results and postoperative complications. Y EUGENIO M. CNDL, MD;
More informationEffects of Photorefractive Keratectomy-Induced Defocus on Emmetropization of Infant Rhesus Monkeys
Effects of Photorefractive Keratectomy-Induced Defocus on Emmetropization of Infant Rhesus Monkeys Xingwu Zhong, Jian Ge, Haohui Nie, Xiaolian Chen, Juan Huang, and Nian Liu PURPOSE. To investigate whether
More informationComparison of Intraocular Lens Power Calculation Methods Following Myopic Laser Refractive Surgery: New Options Using a Rotating Scheimpflug Camera
pissn: 1011-8942 eissn: 2092-9382 Korean J Ophthalmol 2018;32(6):497-505 https://doi.org/10.3341/kjo.2018.0008 Original Article Comparison of Intraocular Lens Power Calculation Methods Following Myopic
More informationIn the early 1990s, photorefractive keratectomy (PRK) and
CLINICAL SCIENCE Collagen Crosslinking After Radial Keratotomy Uri Elbaz, MD, Sonia N. Yeung, MD, PhD, FRCSC, Setareh Ziai, MD, FRCSC, Alejandro D. Lichtinger, MD, Noa Avni Zauberman, MD, MHA, Yakov Goldich,
More informationINTRODUCTION S. HERDENER, D. HAFIZOVIC, M. PACHE, S. LAUTEBACH, J. FUNK. University Eye Hospital, Freiburg - Germany
European Journal of Ophthalmology / Vol. 18 no. 1, 2008 / pp. 39-43 Is the PASCAL -Tonometer suitable for measuring intraocular pressure in clinical routine? Long- and short-term reproducibility of dynamic
More information