Tear Osmolarity and its role in Optometric Practice & Contact Lens Success
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1 Tear Osmolarity and its role in Optometric Practice & Contact Lens Success Nick Dash: Optometrist Declaration of Association Director: See2wiN Ltd (Accuvision/Visual Edge/SportsVision Institute) Honorary Lecturer Cardiff University: Dept. Optometry BSc Cell Biology & Immunology: University Southampton Director: Sports Vision Institute, Loughborough Founder of www. SkiCPD.org Currently no commercial interests in Third Party Companies 1
2 Understanding the Optics of the Eye Max difference in refractive index at air tear film/cornea interface Tear film is the optical surface that has biggest impact on light when travelling through air into the eye. Optical Media Refractive Index Air 1.00 Tear film 1.34 Cornea 1.38 Aqueous humor 1.33 Crystalline lens 1.41 Vitreous humor 1.34
3 Optics Of The Tear Film Tear film stability is critical for the maintenance of visual quality Uniform reductions of tear film thickness have little effect Irregular thickness degrades image quality Patients with Dry Eye have larger optical aberrations compared with normal eyes (by a factor of ~2.5) Percentage of patients suffering from symptoms who report experiencing the symptoms at least 3-4 times per week or more. Artificial tears reduce these abnormalities and improve image quality in patients with Dry Eye Montes-Mico R. Role of the tear film in the optical quality of the human eye. J Cataract Refract Surg. 2007;33: Rev B
4 DEWS Dry Eye Definition Dry eye is a multifactorial disease of the tears and ocular surface that results in symptoms of discomfort, visual disturbance, and tear film instability with potential damage to the ocular surface. It is accompanied by increased osmolarity of the tear film and inflammation of the ocular surface. International Dry Eye Workshop (DEWS). The definition & classification of dry eye disease. Ocul Surf Rev B 4
5 Majority of DED Patients Have Evaporative Dry Eye Disease (EDED) 86% of patients with a classified DED subtype demonstrated signs of Meibomian Gland Dysfunction ADDE EDED Other Pure Aqueous Deficient Dry Eye (ADDE) subtype represented the smallest percentage of patients (~10%) Lemp MA, et al. Cornea. 2012;31: Regardless of the underlying cause, hyperosmolarity is present* *International Dry Eye Workshop (DEWS). The definition & classification of dry eye disease. Ocul Surf Rev B 5
6 Challenges in Dry Eye Disease Patients often present with conflicting signs Low Schirmer s (< 5 mm) with a high TBUT (> 7 seconds) Evidence of staining, but normal Schirmer s and TBUT Symptoms alone are not diagnostic and insufficient to determine severity Questionnaires are nonspecific Patients are unsatisfied with current standard of care; they move from practice to practice seeking better options Existing signs and tests correlate poorly with disease severity Schirmer s, TBUT, staining may not correlate with each other or symptoms Rev B Nichols KK. The Lack of Association Between Signs and Symptoms in Patients with Dry Eye Disease. Cornea 2004; 23(8)
7 Why Measure Tear Osmolarity? Measuring osmolarity allows us to evaluate an objective physiologic marker rather than relying only on subjective signs of the disease such as staining or tear break up time. Baudouin C et al. Diagnosing the severity of dry eye: a clear and practical algorithm. Br J Ophthalmol 2014;98: Sullivan BD et al. An objective approach to dry eye disease severity. IOVS 2010;41(12): Rev B 7
8 Osmotic Pressure Cellular Effect Rev B 8
9 Inter-eye Differences in Dry Eye Disease (DED) R = L The Dry Eye process is characterized by a loss of tear film homeostasis resulting in hyperosmolarity and an unstable tear film Dry Eye is a bilateral and often asymmetrical disease Inter-eye difference >8 mosm/l is an indication of tear film instability, frequently an early manifestation in the development of disease DED has either eye >295 mosm/l Normal Tear Film (Dry Eye) Tears in proper homeostasis should be equivalent to blood osmolarity which is between mosm/l Inter-eye osmolarity difference should be <8 mosm/l International Dry Eye Workshop (DEWS). The definition & classification of dry eye disease. Ocul Surf Lemp MA, Bron AJ, Baudouin C, Benítez Del Castillo JM, Geffen D, Tauber J, Foulks GN, Pepose JS, Sullivan BD. Tear osmolarity in the diagnosis and management of dry eye disease. Am. J. Ophthalmol May; 151(5): Keech A, Senchyna M, Jones L. Impact of time between collection and collection method on human tear fluid osmolarity. Curr. Eye Res Apr; 38(4): Rev B 9
10 Hyperosmolarity Causes loss of Micropilae on the Corneal Epithelium Andrews PM. Journal Cell Bio. 1976;68: Rev B 10
11 Hyperosmolarity Causes loss of Microplicae Schematic Representation Rev B 11
12 Hyperosmolarity Causes loss of Microplicae Gilbard JP. CLAO J. 1985;11(3): Rev B 12
13
14 Hyper-osmolarity: a Core Mechanism of Dry Eye The core mechanisms of dry eye are driven by tear hyperosmolarity and tear film instability Hyperosmolarity causes damage to the surface epithelium by activating a cascade of inflammatory events at the ocular surface and a release of inflammatory mediators into the tears Epithelial damage involves cell death by apoptosis, a loss of goblet cells, and disturbance of mucin expression, leading to tear film instability Instability exacerbates ocular surface hyperosmolarity and completes the vicious circle International Dry Eye Workshop (DEWS). The definition & classification of dry eye disease. Ocul Surf Rev B
15 Dry Eye Cycle Hyperosmolarity perpetuates the Cycle of TF Instability
16 How is osmolarity measured?
17 TearLab Osmolarity System
18 Tear Collection
19 Measurement of Both Eyes is Essential MAXIMUM of the two eyes: >300 mosm/l demonstrates loss of homeostasis and likely to become pathogenic >308 DIFFERENCE between two eyes: Shows the stability of the tear film. Normal tears are stable and <300 mosm/l bilaterally. A difference of >8 mosm/l is a hallmark of tear instability Rev B
20 Effect of Compensatory Mechanisms in Early Stage DED Blinking, aqueous tearing (mixing), increased lipid secretion excretion - all lower osmolarity transiently and asymmetrically < 5 mosm/l Variability mosm/l > 20 mosm/l A Bron, et al. The Ocular Surface 2009 Apr;7(2) A Keech, et al. Curr Eye Res 2013 Apr;38(4) Rev B
21 Dry Eye Tests Protocol for Dry Eye or Ocular Surface Disease Questionnaire (OSDI) Lids Staining Tear Break-up Osmolarity
22 Tear Osmolarity Is the Best Predictor of Disease Severity Schirmers TBUT Meibomian Scoring OSDI Corneal Staining Conjunctival Staining Osmolarity Sullivan BD, et al. Invest Ophthamol Vis Sci : Rev B
23
24 One Px had 3 kcyl D difference between visits
25 Tear Film Placido Disc Image Before and After Dry Eye Treatment Before After
26 Tear Film Osmolarity Correlates with Response to Therapy What treatment strategies we implement do they work? If so do they correlate with improvements in Osmolarity? Rev B
27 Tear Osmolarity Measures Effective Treatment Hyaluronic Acid (HA) Carboxymethyl cellulose (CMC) Optom Vis Sci Apr;90(4):372-7 Montani Giancarlo Optometrist FIACLE, Dept di Optometria, Università del Salento Rev B
28 Osmolarity Showed a Decrease in BOTH Absolute Value and Variabilty After Treatment with HA Nelson JD, Farris RL. Arch Ophthalmol. 1988; 106: Rev B
29 Reduction in Osmolarity Predicts Symptom Response Bilateral tear osmolarity, Schirmer, tear film breakup time (TBUT), staining, meibomian grading, and Ocular Surface Disease Index were measured for a period of 3 consecutive months Participants (n = 52) were recruited from a clinic-based population at 2 study sites. After a 3-month observation period, severe dry eye patients were prescribed topical cyclosporine A and evaluated for an additional 3 months. Sullivan BD, et al. Cornea Rev B
30 Conclusion Hyperosmolarity affects tear film instability and leads to ocular surface damage Osmolarity has a place within a well defined DE protocol Spectacle Rx can be improved by treating tear film instability Multifocal and astigmatic Rx Osmolarity can be used as a predictor to CL fitting success Contact Lens fitting can be improved by: Better lens selection (based on osmolarity reading) Providing Therapy prior and during CL wear times
31 Application to Contact Lens fitting Establish root cause: Aqueous deficient or Evaporative DE Or other eg Allergy Severity Inter-eye instability
32 How does osmolarity testing compare to other test routinely done for CL fitting. Questions we should ask ourselves. What tests do we perform in contact lens fitting or aftercare? How specific and sensitive are these?
33 Contact Lens Fitting with OSP - Ocular Surface Protocol Need for Objective Measures
34 Bottom Line Will Px pay for it? Market 10% women in UK suffer from dry eye Pay s rather than in Symptoms before initiates Inflammatory Cascades. Front office selling. Prescribe and protect patient base Direct Charge & Debit Grading Base (Fee Based Approach: Consult +??.00d/d). Revenue stream similar to Contact Lenses. Revenue as a add-on to standard contact lens charge. Opportunity of outsourcing from Ophthalmologist into Optometric Clinic. Dry Eye / Ocular Surface and lid conditions.
35 Addressing Dry Eye as a Niche or core service Wealth? In the UK 16 million dry eye vrs 18 million myopes (<4 Million Contact Lens Wearers) dry eye industry in UK 224 Million (Growing+++) contact lens industry 250 Million Whats it worth to you?
36 Dry Eye, Measure & Management? PEARLS OF WISDOM! Need a metric. as High Blood Pressure. Objective Metric (Osmolarity) offers, diagnosis, treatments tracking, endorses treatment regimen and lens selection, offers medico-legal justification of treatments or lens selection, greater patient engagement and appreciation of dry eye as chronic ongoing condition, improves patient compliance, differentiate you from other clinicians
37 PEARLS OF WISDOM! Understand dry eye & CLs Dry eye is endemic and there is no cure to Dry Eye. So it exists as stand alone and a co-morbidity to Contact Lenses. No CURE it requires management on an ongoing basis. Continuity of care that includes clinically robust objective measures to support healthy eyes. Engage and Inform patients relate it to their terms or needs: Reduce wrinkles and clear the whites, akin to skin night and day creams (a beauty product) Selling dry eye as youthful white comfortable eyes. White quiet and comfortable.
38 Thank you
Financial Disclosures
March 19, 2015 Financial Disclosures Consultant: Alcon Allergan Bausch & Lomb Modernizing Medicine Ophthalmologyweb.co m Investor: Novabay Ophthotech Ocular Surface Disease Ocular surface disease is often
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