dispensing incontact lens

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Dispensing contact lens

• k.Vijayalakshmi
• SRI RAMACHANDRA MEDICAL COLLEGE AND RESEARCH
  INSTITUTE

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NEED FOR CONTACT LENS

• Optical correction
• Cosmetic enhancement
• Therapeutic reasons

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THE INITIAL EXAMINATION

• PURPOSE
• Determine if the contact lens are indicated or
  contraindicated
• To asses the physiology of the eye

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OCULAR EXAMINATION

• PURPOSE
• OCULAR EXAMINATION DONE TO RULE OUT ANY
  ABNORMALITIES
• SLIT LAMP BIOMETROSCOPY
• O/E ABNORMALITIES
• Lids blephritis ,meibomitis,
• trichaisis,stye,chalazio
  n

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• Conjunctiva pinguecula,pterigium,papillae,
• cystic growth
• Cornea opacity,keratopathy,kconous,
• neovascularisation
• Iris iritis,iridectony
• Tears stability,viscosity,produ
  ction
• Sclera thinning

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DETAILED HISTORY OF SYSTEMIC CONDITION

• SOME GENERAL CONDITION,WICH SHOULD BE APPROACHED
  WITH CAUTION WHILE ADVISING CONTACT LENS ARE
• . DM
• . PREGNENCY
• . ALLERGIES
• . ARTHRITIS
• . SINUSITIS

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OTHER HISTORY ASSESMENT

• . PREVIOUS CL WEAR
• . OCCUPATION AND ENVIROINMENT

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OCULAR MEASUREMENTS

• REFRACTION
• The amount of spherical and cylindrical
  correction is also deciding factor for sclecting
  the type of lens for the patient

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Corneal curvature

• It is the basic and important measurement needed
  before starting CL fitting
• Instruments
• KERATOMETER
• CORNEAL TOPOGRAPHY

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CORNEAL DIAMETER

• HVID
• HORIZONDAL VISIBLE IRIS DIAMETER
• VVID
• VERTICAL VISIBLE IRIS DIAMETER
• measuring by mm scale (nasal to temporal
  limbus)

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Pupil size

• Measured with mm scale
• Done in
• standard illumination
• low illumination,

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TEAR LAYER ASSESMENT

• SCHIRMERS TEST
• PHENOL RED THREAD TEST
• TBUT

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LID TENTION

• TIGHT LID TENTION
• MEDIUM LID TENTION
• LOOSE LID TENTION
• BLINK RATE
• NORMAL BLINK RATE-15
  BLINK/MINUTE

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OPTIONS OF CONTACT LENS

• SOFT CONTACT LENS
• REGID GAS PERMIEBLE CONTACT LENS
• TORIC CONTACT LENS
• THERAPUTIC CONTACT LENS

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WEAR MODALITY

• DAILY WEAR
• WORN DURING WALKING HOURS,REMOVED BEFORE
  SLEEP
• EXTENDED WEAR
• LENS WORN EVEN AT SLEEP ,FOR A WEEK
• CONTINIOUS WEAR
• LENS WORN EVEN AT SLEEP,FOR A MONTH

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THANK YOU?VJ