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Dry Eye Syndrome: Emerging Challenge In Ophthalmology Prof. Dr. M. R. Jain M.s, F I C S( Usa), Faclp ( London), Fams Medical Director M. R. J Institute And Jain Eye Hospital, Jaipur (india) Email: Drmrjain55@gmail.com Dr. M. R. Jain, A Leading Glaucoma Specialist, Is Presently Medical Director And Chief Ophthalmologist M. R. J Institute And Jain Eye Hospital Jaipur. He Has Edited Text Book On Glaucoma, A Book On Ocular Inflammation And Published 130 Scientific Papers In India And Abroad. He Has Been Awarded Life Time Achievement Award By Rajasthan Ophthalmological Society In The Year 2002 & Life Time Achievement Award By All India Ophthalmological Society In Year 2006. Dr. Jain Is Awarded Gold Medal By The 'national Academy Of Medical Sciences' For Research And Clinical Work In The Field Of "glaucoma And Drug Delivery To The Eye." Dry Eye Syndrome, Which Has Been Recently Termed As Dry Eye Disease (ded) (beherens Et Al 2006; Lemp 2008), Is The Most Frequent Disorder In Ophthalmology. Fortunately, Only Infrequently It Becomes Most Severe. Although The Condition Was Recognized As A Clinical Disorder In The Year 1920 And Described Clinically In The Early 1930’s, The Greatest Amount Of Information Both From An Epidemiological And Pathogenetic Perspective Has Accrued During The Last Ten Years. What Is Dry Eye Syndrome? 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. (lemp M. A Et Al 2007) Dry Eye Can Mainly Be Divided In Two Groups, Namely 1. Aqueous Production Deficient 2. Evaporative Prevalence Of Dry Eye. No Authentic Prevalence Survey Has Been Conducted In India But It Is Noted That Out Of The Patients Above The Age Of 30 Years Attending The Outdoor, One Out Of Every Four Has A Complaint Pertaining To Dry Eye. A Recent Survey Conducted In Year 2007 (lemp Et Al 2007), Based Upon A Well – Characterized Population Of Adult Men And Women In The Usa, Identified A Prevalence Of 5 To 30 Percent At Various Age Groups. These Rates Extrapolate To Potentially 9.1 Million Dry Eye Patients In Usa Alone. About 5 Million Americans Above 50 Years Of Age Have Mild To Moderate Dry Eye Disease. In Women At The Age Of 45 To 52 When Menopause Usually Sets In, An Imbalance Occurs Between The Estrogen And Androgen Hormone Due To Decrease Of Androgens After The Menopause. Decrease In Androgen Levels, Excites Inflammation In Lachrymal Gland And Ocular Surface, Disrupting The Normal Homeostatic Maintenance Of The Lacrimal Gland And Ocular Surface. The Factors Which Has Increased The Incidence Of Dry Eye Can Be Narrated As Under A. Increased Longevity Of The Population B. Increased Consumption Of Medication, Both Systemically And Topically Which Have Adverse Effect On The Production Of High Quality Of Tears C. Increased Computer Use (computer Vision Syndrome) D. Increased Contact Lens Use And Cosmetic Surgery Of Lasik/ Lasek E Better Understanding And Diagnosis Of Dry Eye. F Possibly, Adulteration In The Food/ And Pollution. G. Increased Use Of Systemic And Topical Drugs With Preservatives. H. Diabetes Mellitus, Which Is Now Having High Incidence, Is Identified As A Risk Factor For Dry Eye. Tear Fluid Composition The Tear Is Found To Be Composed Of Three Fractions: Albumin, Globulin And Lysozyme. The Immunoglobulins Found In Normal Tear Fluid Are Lga, Lgg And Ige. Lga Predominates In The Secretory Form. Ige Levels Increase In Patients With Allergic Conjunctivitis And Lgm Is Found In Tears Of Patients With Acute Infections. Lysozyme May Act Synergistically With Lga In Causing Lysis Of Bacteria. Tears Also Contain Lactoferrin, Which Has Some Antibacterial Effect. Tears: Vital Statistics: • Average Glucose Concentration Of The Tears Is 2.5 Mg/dl. • Average Tear Urea Level Is 0.04 Mg/dl. • Electrolytes Such As K, Na And Cl Occur In Higher Concentration In The Tears Than In The Blood. • Average Ph Of The Tears Is 7.25. • Osmolality Is 309 Mosm/ Liter (hypertonic In Patients With The Dry Eye Syndrome). • Surface Tension Of The Tear Film Is 40-42 Mn/m. • Refractive Index Of The Tear Film Is 1.336. Under Normal Conditions, The Tear Fluid Forms A Thin Layer Over The Cornea And Conjunctiva, This Is Known As The Pre Ocular Tear Film. The Pre Ocular Tear Film Measures 8 Um Thick And Covers The Corneal And Conjunctival Epithelial Surface. The Pre-ocular Tear Film Acts As An Important Component Of The Ocular Defense Mechanism. 1. It Makes The Cornea A Smooth Optical Surface. 2. It Helps To Wet The Cornea And The Conjunctiva And Prevents Them From Drying. 3. It Flushes Out The Debris And Organisms From The Corneal Surface. 4. It Has Bactericidal Properties Due To The Presence Of Lysozyme, Lactoferrin And Betalysin. 5. Immunoglobulins (lga) And Specific Antibodies In The Tears Defend The Eye Against External Infections. 6. Frictional Trauma Between The Tarsal And The Bulbar Conjunctiva And Cornea Is Minimized By The Lubricating Action Of The Tear Film. 7. It Enables The Anti-inflammatory Cells To Reach The Injured Areas Of The Cornea And The Conjunctiva. 8. It Provides The Epithelial Cells With Glucose, Oxygen And Growth Factors. Distribution System: The Distribution System For The Tear Film Consists Of The Eyelids And The Tear Meniscus Along The Lid In The Open Eye. Each Blink Compresses The Superficial Lipid Layer. The Mucous Layer Acts As A Scavenger To Pick Up Any Lipid Containing Debris And Carry It To The Fornices. As The Eyelid Reopens, A New Tear- Film Layer Is Spread Across The Ocular Surface. Inadequacy Of Any Layer Of The Tear Film Increases Its Instability And May Accelerate Tear Breakup Time (but). The Distribution System Of The Lids Also Acts As A Pumping Mechanism To Draw Tears Into The Excretory System. Functions Of Pre-ocular Tear Film Traditionally A Tear Film Comprises Of Three Layers Outer Lipid Layer It Is Formed By The Oily Secretion Of Meibomian Glands. It Acts As A Lubricant And Prevents Evaporation Of Tears. Middle Aqueous Layer It Is The Main Tear Fluid Liberated From Lacrimal Gland And Accessory Glands. It Contains Proteins, Immunoglobulins, Lysozyme, Lactoferrin And Betalysin. It Provides Moisture To The Eye, Nutrition To The Cornea And Antibacterial Activity. It Provides The Epithelial Cells With Glucose, Oxygen And Growth Factors. It Flushes Out The Debris And Organisms From The Corneal Surface And Drains Into Nasolacrimal Canal. Inner Mucous Layer The Innermost Mucous Layer Of The Tear Film Forms A Highly Hydrophilic Wetting Surface Over The Hydrophobic Epithelial Surface Of The Cornea And Conjunctiva. The Mucous Also Reduces The Surface Tension Between The Lipid Layer Of The Tear Film And The Water Layer, Thus Contributing To The Stability Of The Tear Film. Recent Concept Of Tear Film The Contemporary Concept Of The Tear Ocular-surface Structure Is That Of A Metastable Tear Film Consisting Of An Aqueous Gel With A Gradient Of Mucin Content Decreasing From The Ocular Surface To The Undersurface Of The Outermost Lipid Layer. The Latter Structure Interacts With The Underlying Aqueous And Mucin Components, Retarding Evaporative Loss Of Aqueous Tears And Contributing To The Stability Of The Tear Film Between The Blinks (lemp, 1995). Mucin Layer At Least Three Distinct Types Of Mucin Have Been Identified: Transmembrane Mucins Produced By The Corneal Conjunctival Cells, Gel Forming From The Conjunctival Goblet Cells, And Soluble Mucins Primarily From The Lacrimal Glands.(gipson Et Al, 2004).the Transmembrane Mucins Contribute To The Surface Structure Of The Epithelial Cells, Interact With The Gel-forming And Soluble Mucins Of The Tear Film To Stabilize The Film, And Provide A Cleansing Pathway For The Ocular Surface; Lipid-mucin Interactions Support Relatively Stable Tear Film Between The Blinks. Tear Film Provides Not Only Lubrication And Nutrition To Ocular Surface But Stable Vision (lemp, 2008). All Tissues Of The Ocular Surface, Secretary Glands, Eye Lids And Outflow Channels Of The Nasolacrimal Pathway Are Linked Via A Neural Network (the Lacrimal Functional Unit). Sensory Receptors Monitor Condition Of Tears And Cells, Sending Afferent Signals To The Central Nervous System. That In Turn, Sends Efferent Impulses To The Secretary Glands And Cells, Effecting Changes In The Composition And Volume To Maintain Homeostasis And To Respond To Stress And Injury. Additional Factors Supporting The Tear Film-ocular Surface Complex Include Bioavailability Of Hormones, Primarily Androgens, And An Intact Immune System. This Exquisitely Balanced System Represents A Highly Complex Unit Providing Visual Access To The External Environment. (lemp Et Al, 2007). Derangement Of Anyone Element Leads To A Breakdown In Overall Structure And Function With Significant Clinical Effects. Pathogenesis Of Dry Eye It Is An Established Fact That Any Lacrimal Gland Damage Would Result In Decreased Tear Flow. This Leads To Decreased Washout Of The Tear Surface Debris And Bacterias As Well As Increased Presence Of Inflammatory Cytokines And Decreased Growth Factors To Maintain Ocular Surface Integrity. Almost All Tear Flow Is Due To A Reflex Mechanism Due To Stimuli From Cornea Sending Impulses To The Brain And To The Lacrimal Gland. Any Thing Which Disturbs Corneal Sensations Like Hormonal Imbalance, Contact Lenses, Lasik Surgery Or Any Other Trauma To The Eye, May It Be Surgical Or Accidental. Infection Of The Lacrimal Gland May It Be Primary (dacryoadenitis) Or Immunological Due To Rheumatism Of Joints Or Prolonged Conjunctivitis May Result In Decreased Formation Of Aqueous. As A Result Of Inflammation, Activation Of Matrix Metalloproteinase Enzymes (mmp-9) Was Identified Which Has Further Potential To Damage The Ocular Surface. It Is Now Generally Recognized That Inflammation Is An Integral Part Of The Pathogenesis Of Dry Eye Disease And A Target For Dry Eye Therapy. The Normal Interaction Of The Tear Film And Ocular Surface Is Conditioned By A Background Of Androgenic Hormonal Support That Prevents Inflammation And An Intact Corneal Sensation That Stimulates Secretion By The Lacrimal Gland To Produce Tears That Nourish And Protect The Ocular Surface. When There Is Perturbation Of The Normal Homeostatic Controls, Dry Eye Occurs Either As An Aqueous Tear Deficiency Or Excess Evaporative Loss With Subsequent Damage To The Ocular Surface. This Disease State Creates A Vicious Spiral Of Increasing Inflammation Of The Lacrimal Gland And Ocular Surface That Further Suppresses Normal Corneal Sensation And Leads Not Only To Suppression Of Tear Secretion But To Further Damage To The Ocular Surface. The Aqueous Deficient Dry Eye (keratoconjunctivitis Sicca) Is A Disturbance Of The Neuro-humoral Interaction Of The Ocular Surface Which Interrupts Secretomotor Nerve Impulses To The Lacrimal Gland That Results In Inflammatory Suppression Of Aqueous Secretion, A Necessary Component Of The Tear Film, With Subsequent Damage To The Ocular Surface, Producing Symptoms Of Ocular Irritation And Discomfort. The Evaporative Dry Eye Is A Disturbance Of The Stability Of The Tearfilm, Which Is Usually Due To Abnormalities Of Meibomian Gland Secretion Or Abnormal Eyelid Position And Movement. Both Types Of Dry Eye Results In Damage To The Ocular Surface And Symptoms Of Ocular Discomfort And Impaired Visual Function. Classification Based On Etiology Murube (1996) Has Subdivided Dry Eye In Following 10 Families. These Are: 1. Age Related. Lacrimal Secretion Begins To Decrease After The Age Of 30 Years. At The Age Of 6o, We Reach The Borderline Between The Production And Need. At The Age Of 90, Almost All Persons Have Dry Eye. 2. Hormonal. At The Age Of Menopause Almost Every Women Develops Dry Eye Either Mild Or Moderate. Recent Research Has Shown That It Is Due To Lowering Of Androgen Levels Produced By The Ovaries. Men Develop Dry Eye Related To Hormones With Less Frequency And Intensity Than Women. 3. Pharmacological. There Is Adverse Effect On Production Of Tears Due To Preservatives In Tear Drops Used For Long Period. Glaucoma Patients Are More Prone To This Problem Due To Prolonged Therapy. Systemic Drugs Like Antidepressants, Antihypertensive, Antihistaminic, Anticholinergics, Antipsychotics, Angiolytics, Antiparkinsonians, Diuretics And Hormones Too Can Cause Dry Eye. 4 Immunological: I This Is Related To Autoimmune Reaction In Exocrine Glands Affecting Outside Body Secretion Like Secretion Of Tears, Saliva, Sweat And Vaginal Secretions. The Sjogren’s Syndromes Are Those In Which Patient’s Immunological System Attacks Its Own Exocrine Glands. Rheumatism, Cicatricial Pemphigoid And Erythema Multiform Can Lead To Sjogren’s Syndrome. 5 Infection. Chronic Infection Of Conjunctiva Can Affect Mucous Secretion Leading To Mucin Deficiency And Infection Of Lacrimal Glands Can Affect Aqueous Secretion. Inflammation Of Lids May Affect Oily Secretion. Any Of The Component If Affected, Tearfilm Is Disturbed. 6 Hypo Nutrition. Avitaminosis A, And Alcoholism That Leads To Poor Intestinal Absorption May Give Rise To Dry Eye. 7 Traumatic: Any Trauma To The Eye May It Be Accidental Or Surgical, Can Precipitate Dry Eye. Major Surgeries Like Removal Of Tumour Etc Has More Chances To Cause Dry Eye. Even A Cataract Or Glaucoma Surgery Can Be Responsible To Give Dry Eye Symptoms, Especially In Older Persons. 8 Neurological. A. Post Lasik. Lasik Leads To The Development Of Temporary Dry Eye In About 4 Percent Of Patients. Wilson (2001) Observed Rose- Bengal Staining And Punctate Erosions Without Pre-existing Dry Eye And Labeled It As Neurotrophic Epitheliopathy. He Believes That This Change In Epithelium Is Attributed To Transection Of A Significant Number Of The Afferent Sensory Nerves In The Cornea During Formation Of The Flap And, Therefore, Interruption Of The Cornea-trigeminal Nerve-brainstem-facial Nerve-lacrimal Gland Reflex Arc That Influence Both Basal And Stimulated Tear Production. The Lasik Induced Dry Eye Tends To Resolve Approximately Within 6 Months. B. Contact Lens Wear. Contact Lenses When Worn For Prolonged Period Affect Corneal Sensations And Hence Decrease Tear Secretion. Hard And Semi Soft Lenses Cause Marked Corneal Anesthesia. Moreover, Soft Lenses Absorb Tears And Cause Hypertonic Tears, Which Further Affect, The Corneal Epithelium. Semi Soft Lenses Also Affect Lipid Layer Of The Tear Film. 9. Defective Glands. Responsible For Aqueous, Mucin And Lipid Secretions. 10. Inability To Utilize Tears. There Is Normal Production Of Tears But Cornea Is Unable To Use Them Due To: A. Epitheliopathy Or Corneal Dystrophy, Which Decreases Corneal, Wet Ability. B. Due To Lipid Defect The Lids Are Unable To Circulate The Tears Over The Entire Ocular Surface (lid Paralysis, Lagophthalmos) Symptoms Dry Eye Patient Can Present Any One Of Them Or Multiple Symptoms: Itching, Burning, Irritation, Pain, Discomfort Foreign Body Sensation. There May Be Pain And Photophobia And Blurred Vision That Improve With Blinking. There Is Usually Stringy Ropy Mucous Discharge, Which Can Increase In The Afternoon. The Discomfort In The Eye Usually Increases While Reading, Watching T.v, Air-conditioning System (lower Levels Of Humidity) Or Working On The Computer. At Times There May Be Excess Of Watering, Especially During Breeze. The Main Cause Of Discomfort In The Eyes Is The Elevated Electrolyte Concentration In Tears Leading To Hyperosmolarity And Subsequent Damage To The Ocular Surface. All These Symptoms Are Exaggerated During Dry And Windy Conditions. Patient Has Frequent Desire To Remove Mucous Discharge From The Eyes. Some Of The Patients Give A Typical History Of Desire To Frequently Sprinkle Water Into The Eyes. Visual Acuity Can Be Significantly Affected Especially When Corneal Staining Occurs. In Early Stages, There Can Be Slight Blurring Of Vision Which Requires Frequent Blinking, Resulting In Ocular Fatigue. Signs Tear Lake. Normally At The Lower Lid Margin There Is There Is Concave Tear Meniscus Of 0.3 To 0.5 Mm, Which Is Called Tear Lake. In Dry Eye, It Is Usually Less Than 0.1mm. Debris. There Is Increased Debris In The Decreased Tear Lake. Mucous Threads (strings Of Mucoid Discharge) May Be Seen. Other Signs. Redundant Conjunctiva, Injection Of The Conjunctival Vessels, And Sometimes Mild Chemosis May Be Present. In The Fornix Of The Conjunctiva, The Threads Form Owing To A Slow Tear Flow And Partly Because Of The Increased Number Of The Desquamated Epithelial Cells. In Advanced Cases, The Conjunctival And Corneal Dryness May Be Very Evident And May Be Associated With Chronic Blepharitis And Blepharospasm. Staining. 1. Fluorescein Stain. Fluorescein May Stain Any Denuded Area Of Corneal Epithelium. Staining Is Graded As 0,1,2and 3. 0= No Corneal Stain, 1=1/3 Of Corneal Epithelium Stained, 2= ˝ Of Corneal Area And 3=severe Staining Of ˝ Of Corneal Epithelium. The Reduced Tear Lake Could Easily Be Appreciated With Fluorescein. 2. Rose Bengal Stain. Rose Bengal (solution 1 % Or Strip) Stains The Damaged Devitalized Epithelial Cells Of The Conjunctiva And Cornea. It Can Detect Even Mild Cases Of Keratoconjunctivis Sicca (kcs) By Staining The Palpabral Conjunctiva In The Form Of Two Triangles With Their Base Towards Limbus. Rose Bengal Gives Stinging Sensations But Anesthetic Drug Should Not Be Used As It May Give False Results. Alcian Blue Has Similar Properties As Rose Bengal But Is Not Usually Available. 3 Film Break Up Time. (tbut) It Is A Quantitative Measurement Of Tear Film Stability. A Mucous Deficiency Results In Beading Of The Aqueous Tear Around The Small Amount Of Available Mucous On The Epithelial Surface And Reduction Of Tbut. The Test Is Performed By Asking The Patient Not To Blink For 10 Seconds After Instillation Of Fluorescein. Appearance Of A Dark Spot (dry Area) Before 10 Seconds Is Abnormal. Mild To Moderate Dry Eye Patients Shall Usually Have Tbut Of 2-3 Seconds. Diagnosis. Diagnosis Is Most Often Based On The Complaint Of The Patient Without Any Evident Cause In The Eye. Quite Often, Persistent Fishing For Ropy Mucous Discharge Is Very Classical And So Is The Importance Of The Complaint Of Increased Discomfort In Dry And Windy Environment. Diagnostic Tests Mostly Employed Are As Under A. Schirmer Test. The Test Is Used To Quantitatively Measure The Tear Secretions By The Lacrimal Gland, And Should Be Done Before Any Other Examination As The Manipulation Of The Eyelid And Eye Can Alter The Results Of The Test. Shirmer I Test. Is Used To Measure Tear Secretion Rate Without Anesthesia. Shirmer Ii Test Is Done Similar To Shirmer One But After Instillation Of Anesthetic Drops. After Instillation Of Anesthetic Drops, The Amount Of Tear Secretion Is Closure To The Basal Secretion Rate As There Should Be No Stimulus From The Filter Paper Strip Placed In The Inferior Conjunctival Sac. A Value Of Less Than 5.0 Mm Is Considered Abnormal. The Test Is Quite Often Not Conclusive. B Tear Function Index (tfi) Test. It Is A More Specific And Sensitive Test To Quantitatively Measure The Tears. It Takes Into Account The Influence Of Tear Drainage In The Measurement Of Tears With Shirmer Test. Its Numerical Value Is Obtained By Dividing The Shirmer Ii Test Value In Millimeters By Tear Clearance Rate. The Higher The Numerical Value Of Tfi, The Better The Ocular Surface. Values Below 96 Suggest Dry Eyes. C Fluophotometery. It Is Another Way To Measure Tear Secretions. It Uses Decay Of Sodium Fluorescein To Measure The Tear Flow And The Tear Volume. This Test Is Costly And Not Very Informative. D Tear Osmolarity. It Provides Qualitative Assessment Of Tear Formation. The Reference Value Is 312 Mosm/l. This Value Increases With The Severity Of The Dry Eye. E Impression Cytology, Conjunctival And Lateral Salivary Gland Biopsy May Be Used To Diagnose The Etiology Of The Disease Process. In Dry Eye States There Is Marked Decrease In Goblet Cell Count. Classification Of Dry Eye Syndrome: Mild Dry Eye Syndrome: Can Be Defined In Patients Who Have A Shirmer Test Of Less Than 10 Mm In 5 Minutes And Less Than One Quadrant Of Staining Of Cornea Moderate Dry Eye Syndrome: Shirmer Test Results Of 5-10 Mm In 5 Minutes With Or Without Punctate Staining Of More Than One Quadrant Of The Corneal Epithelium. Severe Dry Eye Syndrome: Can Be Defined As Diffuse Punctate Or Confluent Staining Of The Corneal Epithelium, Often Its Filaments. Schirmer Test Mostly Less Than 5 Mm In 5 Minutes. Sjogren Syndrome Is Classically Associated With Severe Dry Eye Symptoms. Treatment Conservative 1. Patient Information. Patient Must Be Educated And Fully Informed About The Disease As Well As He Must Be Explained The Limitations Of Medical Management. This Maintains The Patient’s Confidence In Your Line Of Treatment. 2. Controlling The Surroundings. Special Stress Must Be Put To Control The Surroundings To Minimize The Severity Of The Condition. A. Still Air. Patient Must Avoid Sitting Facing Direct Flow Of Air From Air Conditioners, Ventilators, Windows Or Fans. It Is Better That Patient Avoid Sitting In Front Of Door In A Room. While Driving Car, The Car Window Must Be Closed And The Patient Should Use Glasses. Car A.c. Wind Should Not Blow Directly On The Face. B. Humid Air. Even If There Is No Refractive Error, Patient Must Wear Glasses. Just By Wearing Spectacles, The Humidity Between The Eyes And The Spectacles Rises By 2 %. Spectacles With Side Panels And Moist Chamber May Be Reserved For More Severe Cases. Humidifiers Must Be Used In The Rooms. There Are Air-conditioners Available With Attached Humidifiers. Special Glasses With Moist Inserts Ameliorate Severe Dry Eye Symptoms. The Moist Inserts On The Side Panels Increase The Ambient Humidity, Resulting In A Decrease In The Tear Evaporation From The Ocular Surface. Another Type Of Moist Chamber Is Obtained More Easily And Less Expensively By Using Swimming Goggles. The Most Favorable Range Of Relative Humidity For Minimizing Tear Evaporation Is Reported To Be 40% To 50 %. Wet Gauze Mask Is An Alternative Treatment Modality. C. Pure Air. Polluted Air Is Very Harmful For Dry Eye Patients. Palpabral Aperture Must Remain Open As Little As Possible. Closed Window In The Car, Helmet With A Shield While Driving Scooter And Covering Your Eyes With Goggles While Driving Bicycle Gives Some Relief. While Reading Books, The Book Should Be Kept As Close To Chest As Possible So As To Have Minimum Palpabral Aperture. While Looking Down, Ocular Surface Exposed To The Air Is Just 1 Square Centimeter, Whereas While Looking Straight, 2.0 Sq. Cm. And While Looking Up, 3,0 Sq. Cm. Computer Vision Syndrome. While Looking At The Monitor, The Eyes Have The Tendency To Stare At The Screen Thereby Reducing The Blink To About 6-7 Blinks A Minute. If The Computer Is At A Higher Level Than The Eye, There Is Further Increased Evaporation Of Tears. To Avoid Computer Vision Syndrome, One Must Keep The Video Display Terminal At The Lower Level Than The Eyes And A Habit Must Be Formed To Blink About 10-12 Times Per Minute. When Working For Long Period, One Must Close The Eyes For Some Time Or Use Some Artificial Teardrops. A Humidified Environment Is Recommended To Reduce Tear Evaporation. Medical Management Tear Substitutes. Tear Substitutes Are The Mainstay In The Medical Management Of Dry Eye. Variety Of Tear Substitutes Is Available. Hypotonic Non-viscous Solutions Counteract The Hyper Tonicity In Dry Eye Syndrome And Can Last Up To Two Hours. Viscous Solution Contains Cellulose As Their Base And Thus Last Longer. Preservatives Are Added To Increase The Shelf Life And The Stability Of The Solution. The Commonly Used Preservatives Include Benzalkonium Chloride, Thimerosal, And Chlorhexidine. In Spite Of Their Low Concentration, They Can Produce Toxic Effect On The Cornea And Conjunctiva And Adversely Affect The Dry Eye Condition. Preservative Free Drops The Use Of Unpreserved Collyria, And More Recently Preservatives That Are Transient Or Which Rapidly Oxidize To Non-toxic Compounds Upon Exposure To Air And The Ocular Surface, Has Become Routine For Those Patients Requiring More Than Three Or Four Lubricant Drops Per Day. The Tear Supplements Have Focused On Maintaining A Hypotonic Collyrium With Normalization Of Electrolyte Concentration To Combat The Damaging Effects Of Hyper Tonicity. In India, Such Non- Reactive Tear Substitutes Are Marketed As: Ecotear Drops ( Intas Pharmaceuticals Ltd)carboxy Methyl Cellulose 0.5 Percent Refresh Tear Drops (allergan) It Contains Carboxymethyl Cellulose Sodium 5 Mg With Stabilized Oxychloro Complex 0.05mg. (purite) Gen Teal Drops And Gel (novartis) It Contains Hydroxypropylmethyl Cellulose 0.3 % With Stabilized H2o2. Eyemist Drops (avesta) It Contains Hydroxypropylmethyl Cellulose 0.3 % With Stabilized Oxychloro Complex 0.005 %. Tear Drops (milmet) Contains Sodium Carboxymethyl Cellulose 5.0 Mg With Stabilized Oxychloro Complex 0.005 %) Refresh Liquigel (allergan) It Contains Carboxymethyl Cellulose Sodium 1 %. Presently, There Are 40 Brands Of Preservative Free Tear Substitute Drops & Gel Utilizing Hydroxypropyl Methylcellulose & Carboxymethyl Cellulose. Imported Tear Substitutes Refresh Pm (allergan) Gel Viscous Tear (ciba) Tears Naturale Free (alcon) Bion Tears (alcon) Lagricel Ofteno (sophia Laboratories) It Contains Sodium Hyaluronate. Hyalein Mini 0.1 % And Hyalein Mini 0.3 % (santen’s Japan) Contain Sodium Hyaluronate. Refresh Endura Drops (allergan). It Is Lipid Emulsion, Which Reduce Tear Evaporation And Stabilize The Tearfilm, Thereby Reducing Frequency Of Tear Instillation. Tear Substitutes Are Instilled In The Eyes 3- 6 Times A Day, Depending On The Severity Of The Condition. If Necessary, Refresh Liquigel Or Celluvisc Is Instilled At Bedtime. Androgens Role Of Androgen As A Therapy Is Yet Not Well Established Though It Is Known That In Females, Lack Of Androgens Play Important Role In Its Etiology. Topically, Androgenic Supplementation Of Artificial Tears Appears To Lower The Osmolarity Of Patient’s Tears Either By Retarding Evaporation Or Possibly Stimulating Tear Secretion. This Gives An Indication That Adding Androgenic Hormones To Artificial Tears Might Benefit Dry Eye Patients. A Trial Of Topically Applied 0.03% Testerone Was Reported To Increase The Percentage Of Patients That Had Meibomian Gland Secretions With Normal Viscosity And To Relieve Discomfort Symptoms After 6 Months Of Treatment As Compared To Vehicle. Tear Stimulants The Use Of Oral Or Sublingual Pilocarpine (salagen, Mgi Pharma) Has Proven Useful In Some Patients But Has Been Associated With Systemic Side Effects Of Sweating And Gastrointestinal Upset. Cevimeline (evosac, Daiichi Pharmaceuticals, Inc) Also Stimulate Tear And Salivary Secretion And May Be Better Tolerated Than Pilocarpine. Systemic Use Of Congeners Of Bromhexine Have Been Tried In Europe With Unsatisfactory Results. Recent Trials With Purinergic P2y2 Agonist Has Reached Phase Three Trials In Usa. The Medication Designated Diquafosol Tetrasodium (inspire Pharmaceuticals, Usa) Has Been Extremely Well Tolerated And Increases Tear Film Volume And Mucin Content. The Pharmacological Action Is To Increase Fluid Transport Across The Conjunctiva And Stimulate Mucin Release From Goblet Cells. Cyclosporin A Looking To The Immunological Aspect Of The Disease, Cyclosporin A In The Form Of Topical Drops (0.05 % & 0.1 %) Is Being Used In Moderate To Severe Form Of Des To Treat Inflammation Of The Ocular Surface And Lacrimal Gland. The Drops Are Instilled Twice A Day And The Beneficial Results Are Observed Within Four To Six Months. The Drug May Have To Be Used For Whole Life. Cyclomune Is An Immunomodulator. It Selectively Suppresses Lymphocytic Functions Involved In A Disease Without Actually Suppressing The Entire Immune System. It Inhibits T Helper Cells That Are Known To Cause Inflammation Of The Ocular Surface And Lacrimal Glands In Patients With Dry Eye. A Significant Decrease In The Number Of Cells Expressing The Lymphocyte Activation Markers Cd11a And Hla-dr Were Observed, Indicating Less Activation Of Lymphocytes Compared With Vehicle Treated Eyes. The Main Indication For The Use Of Cyclomune Is Surface Staining Of The Cornea. Instillation Of Drops Is Associated With Stinging Sensations, Which Gradually Decrease. Cyclosporine Drops Are Marketed By Allergan As Resstasis In Usa And By Avesta In India As Cyclomune( 0.05 & 0.1% Drops ) Two Additional Immunophillins, Namely, Pimecrolimus And Tacrolimus, Have Been Recently Evaluated In Clinical Trials Of Kcs. Essential Fatty Acids: Omega-6 And Omega-3 Are Essential Fatty Acids. In Typical Western Non-vegetarian Diet, 20-25 Times More Omega-6 Than Omega-3 Fatty Acids Are Consumed.omega-6 Fatty Acids Are Precursors Of Arachidonic Acid And Certain Proinflammatory Lipid Mediators (pge2 And Ltb4). In Contrast, Certain Omega-3 Fatty Acids (eg,epa Found In Fish Oil) Inhibit The Synthesis Of These Lipid Mediators And Block Production Of Il-1 And Tnf-alpha. Fish Eaters Are Said To Be Relatively Resistant To Dry Eye. Cod Liver Oil May Be Useful . Meibomitis. A Recent Study In Usa Has Shown That About 38 % Patients With Dry Eye Have Concurrent Meibomian Gland Involvement. (mathers M. D. 2000). Hot Wet Compresses, Betadain Scrub, Eyelid Massage And Oral Tetracycline Or Its Substitutes Namely, Doxycycline And Minocycline, May Treat Meibomian Inflammation. Tetracycline Is Effective As An Antibacterial, Mainly Against Sensitive And Resistant Strains Of Staphylococci Which Results In Decrease In Lipase Production, Making The Oily Secretion More Liquid And Hence It Flows Out Freely From Meibomian Glands. At High Concentrations, Tetracyclines Inhibit Staphylococcal Exotoxin-induced Cytokines And Chemokines. Tetracycline Is Given 2 Hours Before Meals In Divided Doses. It Is Given As Capsule 500 Mg B.d. For Two To Four Weeks. Doxycycline Is More Widely Used. It Is Usually Given As 100 Mg Dose Once A Day For 2 To 3 Months, In An Intermittent Fashion. Some Workers Recommend Low Dose Doxycycline Of 20 Mg Bd For A Long Term Period. Topical Steroids Topical Steroids Are Being Tried In Some Of The Resistant Or Advanced Cases Of Dry Eye Or In Patients Who Have Severe Itching. Loteprednol Etabonate 0.5% Instilled Qid Is A Good Choice For Long-term Use. It Is Soft Steroid That Is Activated By Enzymes As It Passes Through The Cornea. It Seems To Have Very Little Effect On Iop. It Is Marketed As Lotemax (0.5 %) By Bausch & Lomb And As Lotepred Drops 0.5 Percent By Sun Pharmaceutical In India. Recent Trials With Non Preserved Methyl Prednisolone 1 % Drops Instilled For 2 Weeks In Cases Of Kcs Have Shown Rewarding Results Without Rise Of Iop. Immunosuppressant Therapy In Advanced Cases Of Des, Systemic Cyclosporin A, Prednisolone, Methotrexate, Infliximab May Have To Be Given Under The Supervision Of A Competent Physian. Lasik Induced Dry Eye Clinically Post Lasik Patients May Show Punctate Epithelial Erosions And Rose Bengal Staining Of The Flap. (neurotrophic Epitheliopathy). All Cases Of Lasik Has To Be Put On Liberal Use Of Preservative Free Tear Substitute Drops Immediately After The Surgery And Continued For A Period Of 4- 6 Months. It Is Noted That Almost All Cases Recover Within Six Months. Only Few Patients, Who Already Had Dry Eye Symptoms Before Surgery, May Require Punctual Plugs. Mucolytics. Topical 5 Percent Acetylcysteine Drops Are Recommended For Instillation Four Times A Day. It Is Effective In Eyes With Excessive Mucous. Future Therapies. Apart From Tear Substitutes, Anti-inflammatory Therapy, Androgen Hormone Replacement, And Tear Stimulant Diquafosol Tetrasodium May Form Main Therapeutic Measures. Herbal Supplements Such As Oil Of Primrose And Flax Seed Oil Are Reported To Be Help In Relieving Symptoms Of Dry Eye And Meibomitis. Essential Fatty Acids Specially Omega-3 Category Food Supplements, Specially Fishes, Are Showing Promising Results. Surgical Management A. Canalicular Obstruction By Punctal Plugs It Is A Simple Procedure That Decreases The Tear Drainage Markedly And Improves The Qualitative And Quantitative Component Of Tears. A Decrease In Osmolarity Of The Tears Is Noted. Improvement Can Be Seen By Shirmer And Tbut Test. Several Methods Of Punctal Occlusion Have Been Described Including Dissolvable Collagen Stents, Cyanoacrylate Adhesive, Removable Silicon Or Teflon Plugs, Or Intracanalicular Plugs. The Most Recently Approved Innovation Is Smart Plug (medennium Inc) That Is A Thermolabile Polymer That When Inserted Into The Canaliculus Conforms To The Diameter Of The Canaliculus To Produce Occlusion. Canalicular Block Is Obtained By Inserting A Silicon Plug In The Puncta. There Are Two Types Of Plugs: A. Punctal Plug A. In This Part Of The Plug Remains Visible Over The Puncta B. Punctal Plug Resides Completely Within The Canalicular Canal. (herrick Plug) Almost 75 Percent Of Patients Tolerate The Plugs Well. In Some Of The Patients, We May Have To Remove The Plugs. The Insertable Variety Can Be Eliminated From The Canaliculus By Irrigating The Canal With Saline. B. Canalicular Obstruction By Cautry. Puncta Can Be Temporarily Blocked By Thermal Or Diathermy Cautry Or By Argon Laser. An Argon Laser Focused On The Punctal Surface Causes Overheating And Destroys The Punctum. (results Not Reliable) C. Punctal Patch Technique This Is Most Efficacious Surgical Technique For Long Lasting Occlusion Of The Lacrimal Drainage System. In This Technique A Raw Area Is Created Surrounding Upper And Lower Puncta. A Piece Of Bulbar Conjunctiva Is Taken And Transplanted To The Punctal Wound With Its Raw Surface In Contact With The Lid And Sutured To It With Four 9. 0 Stitches. Summary Dry Eye Disease Appears To Be On Increase Due To Multiple Factors. Inspite Of Great Advance In Understanding And Diagnosing The Disease, The Disease Remains A Challenge To Medical Profession. Preservative Free Drops Have Significantly Improved The Quality Of Life Of Dry Eye Patients. Anti-inflammatory Therapy, Androgen Hormones And Tear Stimulants, Namely, Diquafosol Tetrasodium And Probably Some Herbal Drugs Hold Great Hope For A Des Patient. Cyclosporine Has Proved To Be A Boon To The Management Of Moderate To Severe Dry Eyes. Preliminary Experience Using New Therapeutic Approach Suggests That Quality Of Life Can Be Improved For Many Patients With Dry Eye And Initiating These Strategies In The Early Course Of The Disease May Prevent Potentially Blinding Complications Of Dry Eye. The Future Therapies Will Focus On Replacing Specific Tear Factors That Have An Essential Role In Maintaining Ocular Surface Homeostasis Or Inhibiting Key Inflammatory Mediators That Cause Death Or Dysfunction Of Tear Secreting Cells. F Shri Sudhinder Gemawat Chief Patron Jaipur Cancer Relief Society 3-na-3, Jawahar Nagar Jaipur. Tel. 2651973. My Dear Shri Gemawat, I Must Heartily Congratulate You & Your Team For Doing Such A Commendable Work To Serve The Society With Great Dedication.it Is A Great Service That You Are Doing To Some Of The Less Fortunate People Of The Society. I Must Also Congratulate You, Smt.kusum Patni & Dr.arun Chogle For Bringing Out Such A Beautiful Magazine Containing Large Number Of Educative & Inspiring Articles. I Have Known You For A Long Time But Nerve As A Poet. I Read Two Of Your Extremely Expressive & Inspiring Poetries. Magazine Contains Large Number Educative & Informative Articles Which Is A Great Step Against Fighting Cancer. I Would Request That There Should Be Exclusive Stress In Favor Of Vegetarianism To Combat & Higher Incidence Of Cancer In Western Countries. I Am Sending A Cheque Of Rs.2500/- In Favor Of Jaipur Cancer Relief Society As A Small Token Of Help To The Needy. I Recollect The William Wordsworth “the Best Portion Of A Good Man’s Life Is His Little Nameless, Unremembered Acts Of Kindness & Love”.your Team Under Your Dynamic Leadership Is Following Mr Wordsworth In True Spirit. With Regards & Wishes For Your Useful Long Life To Benefit The Society. Yours Truly, (dr.m.r.jain) Enclosed: Cheque No. 386247 Of Rs.2500/- (by Dr.mohan Raj Jain)
Harmail Singh | March 12, 2011 5:30 PM My father had suffered from dengue fever about 5 months ago. his platelet .. Hi Harmail, we need the reports of the patient especially MRI brain to suggest the benefits of Speech therapy.
Surender Godara | April 25, 2011 12:30 PMSir, please help me, my son's age is 11 years and he wets his bed while sleeping.. Surender, more than medicines your baby requires counseling and bladder training...
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