Introduction to cl fitting
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This document outlines the process for contact lens fitting, which includes patient screening, preliminary examinations and measurements, trial lens fitting, lens dispensing, and aftercare. The preliminary examinations involve assessing the anterior segment, measuring keratometry, corneal and pupil size, lid characteristics, and tear production. Trial lens fitting involves selecting lenses of varying parameters until an optimal fit is achieved based on criteria like centration and movement. After fitting is complete, patients are instructed on lens care and insertion/removal and scheduled for follow-up visits to monitor fit and address any issues.
Introduction to cl fitting
- 1. Contact Lens Fitting 1. Introduction to Contact Lens Fitting
- 2. CONTACT LENS FITTING – PROTOCOL Patient screening Preliminary examination & measurements Trial lens fitting Lens dispensing After-care
- 3. PATIENT SCREENING Establish why the patient wants CLs Is the patient suitable for CLs ? Obtain baseline information Advise patient of their options
- 4. PRELIMINARY EXAMINATION AND MEASUREMENTS A slit-lamp examination of the anterior segment. Keratometry. Corneal and pupil size measurements. Assessment of lid characteristics. A tear assessment. A spectacle refraction and calculation of the ocular Rx (corneal-plane refraction).
- 5. KERATOMETRY Corneal curvature is the most important measurement needed before starting CL fitting. Measures only 3 mm of the corneal curvature Corneal topography gives the complete mapping of the cornea. KR measurement is sufficient in most of the fittings.
- 6. Corneal irregularity also noted. The reading also tell us about the degree of corneal astigmatism. The BC of the CL is determined by the corneal curvature measurements.
- 7. CORNEAL DIAMETER HVID – Horizontal Visible Iris Diameter VVID – Vertical Visible Iris Diameter With a simple millimeter scale ,measuring the limbus to limbus size both across the horizontal and vertical lengths. The corneal diameter aids in determination of the total diameter of the CL.
- 8. PUPIL SIZE The diameter of the pupil is measured by a simple millimeter scale both in standard room illumination and low illumination . This aids in determining the optic zone size of the CL.
- 9. TRIAL FITTING: ROUTINE Diagnostic fitting A diagnostic or trial fitting uses a series of lenses, chosen on the basis of the findings of the preliminary examination. Lenses are assessed sequentially until a desirable fit is obtained. The aim of the trial fit is ensure a good lens- cornea relationship with the design chosen and to confirm the final Rx required. Final lens order
- 10. TRIAL FITTING: LENS SELECTION Back optic zone radius (BOZR). Total diameter (TD). Water content (for soft contact lenses). Lens design (lenticular, multicurve, surface shape, etc.). Lens type (spherical, toric, bifocal, etc.). Lens material. BVP
- 11. TRIAL FITTING: PROCEDURE Initial lens selection. Trial lens fitting and vision assessment. Subsequent trial lens selection. If Trial lens required is not available: Empirical Prescribing
- 12. TRIAL FITTING: DESIRED RGP LENS FIT Central alignment. (BOZR of the lens closely matches the central corneal curvature) Moderate edge clearance Good centration. Corneal Coverage (SCL) Adequate movement Comfort
- 13. TRIAL FITTING: FINAL LENS ORDER Lens parameters Lens material and type Special requirements Delivery date required
- 14. LENS DISPENSING •Provide information on the lens care regimen • Practise insertion and removal techniques • Provide information on adaptation • Provide information on signs of complications • After-care visit schedule
- 15. AFTER-CARE Investigate complaints Perform general ocular examination: - Over-refraction - Slit-lamp microscopy - Other tests particular to the patient Assess lens fit Review lens care regimen Schedule next after-care visit
- 16. THANK U