MECHANISMS. Dr. WILLIAM J. BENJAMIN. Eye Physiology & Ocular Prosthetics Laboratory. School of Optometry
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1 OCULAR DEFENSE MECHANISMS Dr. WILLIAM J. BENJAMIN Eye Physiology & Ocular Prosthetics Laboratory University of Alabama at Birmingham School of Optometry Presented at the UAB School of Optometry as Part of MIC 200: MICROBIOLOGY and IMMUNOLOGY October 28, 2008
2 HOW THE EYE PROTECTS ITSELF BONY ORBITS AND BROWS LIDS, CILIA, AND BLINKING AQUEOUS TEAR FLUID CORNEAL DEFENSES DEFENSES OF CONJUNCTIVA & LIMBUS AQUEOUS, VITREOUS, LENS, UVEA, RETINA NORMAL OCULAR BACTERIA & FUNGI
3 ROLE OF EYELIDS CILIA AND COLLECTION OF PARTICLES BARRIER FUNCTION VASCULATURE AND LYMPHATIC SYSTEM FATTY ACIDS, OILS, AND WAXES BLINKING
4 THE BLINK AND BLINKING LID APPOSITION AND SQUEEGEE ACTION ADHERENCE AND THE MUCIN THREAD TEAR ROUTE DURING WAKING HRS. LACRIMAL PATENCY & PUNCTAL PLUGS DAKRYOCYSTITIS & ANGULAR CONJ ITIS TEAR ROUTE DURING SLEEP LAGOPHTHALMOS & ROLE OF REM s
5 AQUEOUS TEAR FLUID ROLE OF OILY LAYER LYSOZYME BETA LYSIN LACTOFERRIN IMMUNOGLOBULINS: IgA ROLE OF MUCIN LAYER
6 AQUEOUS TEAR FLUID
7 AQUEOUS TEAR FLUID ROLE OF MUCIN LAYER
8 PHYSIOLOGICAL DEFENSES OF THE CORNEA CORNEAL TEMPERATURE OPEN vs. CLOSED EYE; PATCHING INTERCELLULAR EPITHELIAL JUNCTIONS ADHERENCE TO BASEMENT MEMBRANE
9 PHYSIOLOGICAL DEFENSES OF THE CORNEA MICROVILLI AT EPITHELIAL SURFACE SURFACE RENEWAL EVERY 7 DAYS INFILTRATION FROM TEARS, LIMBUS
10 NORMAL OCULAR FLORA (& FAUNA) NORMAL BACTERIAL FLORA NORMAL FUNGAL FLORA NORMAL VIRUSES (?) NO NORMAL CHLAMYDIA, PROTOZOANS MITES: Demodex folliculorum & brevis Worm-Like mites, mm long
11 NORMAL FUNGAL OCULAR FLORA FUNGI FROM ENVIRONMENT, AIR, SOIL Candida albicans Aspergillus fumigatus 83+ DIFFERENT SPECIES IN NORMAL EYES INCONSISTENCY WITHIN INDIVIDUALS LARGE EFFECT OF CLIMATE, OCCUPATION CAN ALSO BE PATHOGENS
12 NORMAL BACTERIAL OCULAR FLORA BACTERIA OF SKIN, RESPIRATORY TRACT Staphylococcus epidermidis: 50-80% Staphylococcus aureus: 20-50% Corynebacterium sp. (Diphtheroids): 20-45% 100+ OTHER SPECIES IN NORMAL EYES
13 NORMAL BACTERIAL OCULAR FLORA Coag. ( ) Staph. Coag. ( ) Staph.
14 NORMAL BACTERIAL OCULAR FLORA CONSISTENT WITHIN INDIVIDUALS CONSTANT WITH CLIMATE / GEOGRAPHY SECRETION OF INHIBITORY BACTERICINS Coag. ( ) Staph. Diphtheroid
15 NORMAL BACTERIAL OCULAR FLORA GRAM ( ) PATHOGEN CARRIERS: ~ 20% Ocular Typhoid Maries Making Eye Contact Going Eyeball to Eyeball Cross-Contamination by Contact Lenses Goldmann Tonometer Tips PATHOGENS AND CLIMATE / GEOGRAPHY
16 NORMAL BACTERIAL OCULAR FLORA Coag. ( ) Staph. Diphtheroid
17 NORMAL BACTERIAL OCULAR FLORA Staphylococcus aureus Corynebacterium diphtheriae
18 NORMAL BACTERIAL OCULAR FLORA Corynebacterium diphtheriae
19 BACTERIA ON LID MARGINS & CONJUNCTIVA THOSE FOUND ON LESS THAN 5% OF EYES GRAM (+) COCCI Streptococcus sp. Streptococcus pneumoniae Micrococcus sp. GRAM ( ) COCCI Neisseria sp. Moraxella catarrhalis
20 BACTERIA ON LID MARGINS & CONJUNCTIVA THOSE FOUND ON LESS THAN 5% OF EYES GRAM (+) BACILLI Bacillus sp. GRAM ( ) BACILLI Escherichia coli Haemophilus sp. Klebsiella sp. Proteus sp. Pseudo. aeruginosa Serratia marcescens
21 NORMAL BACTERIAL OCULAR FLORA Bacillus cereus
22 NORMAL BACTERIAL OCULAR FLORA Bacillus cereus
23 NORMAL BACTERIAL OCULAR FLORA Bacillus cereus
24 NORMAL BACTERIAL OCULAR FLORA Micrococcus sp. (yellow colony)
25 BACTERIA ON EYELIDS POST-SURGICAL ENDOPHTHALMITIS DUE TO Normal Bacterial Flora MOST COMMON IS COAGULASE ( ) STAPHYLOCOCCUS INCIDENCE ~ 1 PER 750 SURGERIES Increased 2.5 to 6x for Clear Corneal Cataract Extractions BABY SHAMPOO NOT ANTIBACTERIAL 10:1 dilution Harsh on tender eyelid skin ANTIBACTERIAL SOAPS CONTAIN BAK or EtOH Not good for use around the eye
26 BACTERIA ON EYELIDS EYELID HYGIENE Linalool: Liquid distilled from oils of flowers, spice plants, tea trees. It has a pleasant floral scent and is anti-microbial microbial. distilled Effective vs. Pseudomonas
27 BACTERIA ON EYELIDS STERILID AVAILABILITY Over-the-Counter (OTC) In a Kit by Prescription with Minocycline HCl tablets to be taken orally. (Rx)
28 BACTERIA ON EYELIDS EYELID HYGIENE Lid Scrub + ES: >99% effectiveness vs. S. aureus, E. coli, P. aeruginosa, S. marcescens, and M. catarrhalis.
29 BACTERIA ON EYELIDS EYELID HYGIENE Betadine 5% Ophthalmic Prep Solution: by Alcon Povidone-Iodine Normal surgical scrub is 10% Intended for Irrigation of cornea, conj. Periocular antiseptic Sterile and non-irritating Possible Treatment for EKC
30 PHYSIOLOGICAL DEFENSES OF THE ANTERIOR SEGMENT CONJUNCTIVA AND LIMBUS Vascular Supply & Immune System Lymphatic System AQUEOUS FLUID Blood-Aqueous Barrier Break-Down IgG, IgA, Complement CRYSTALLINE LENS Barrier of Capsule, Anterior Epithelium No Immune or Lymphatic Systems
31 PHYSIOLOGICAL DEFENSES OF THE POSTERIOR SEGMENT VITREOUS GEL / FLUID Not Much Defense UVEA Vascular Supply & Immune System No Lymphatic System RETINA Vascular Supply & Immune System Blood / Retinal Barrier No Lymphatic System
32 EFFECT OF AGING ON OCULAR MICROBIOLOGY LYSOZYME DECREASES CONJ. CRACKS, CREVICES DRY EYE INCREASES BACTERIAL & FUNGAL CONJ ITIS BACTERIAL & FUNGAL KERATITIS EYELID WRINKLES, CREVICES BACTERIAL & FUNGAL BLEPH ITIS
33 EFFECT OF AGING ON OCULAR MICROBIOLOGY CONJUNCTIVAL CRACKS, CREVICES EYELID WRINKLES, CREVICES Bulbar Conjunctiva Palpebral conjunctiva
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