OM t of c.iii - Vision Research Coordinating Center - Washington ...

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2/22/96 Chapter 9 Contact Lens Fit Assessment page 9-7 9.4 Protocol for Habitual Contact Lens Fit Assessment In rigid contact lens-wearing CLEK Study patients, the Clinician assesses the apical and peripheral fit of the patient’s habitual rigid gas permeable contact lenses. The Clinician enters these data onto the CLEK Examination Form. Fluorescein photographs are taken of the patient’s habitual contact lens fit, according to the Fluorescein Photography protocol detailed in Chapter 10 of this Operations Manual. 9.5 Lens Verification Protocol Accurate analysis and verification of CLEK Study patients’ habitual contact lens parameters are important. Table 9-3 lists the Study lens parameters to be verified and the instrumentation to be utilized. Data are recorded on the CLEK Examination Form. Table 9-3. CLEK Study contact lens verification. Lens Parameter Verification Instrument Base curve Radiuscope, keratometer, handheld keratometer Lens power Lensometer Overall diameter Hand-held 7X reticule Optic zone diameter Hand-held 7X reticule Center thickness Thickness gauge 9.6 Summary The assessment of CLEK Study patients involving rigid contact lenses can be summarized as follows. Steps 1 and 2 are performed on rigid lens-wearing CLEK Study patients only. Steps 3-7 are performed on all CLEK Study patients. (1) Assess and photodocument the fluorescein patterns of the patient’s habitual rigid gas permeable contact lenses. Enter the assessment of central and peripheral fit on the CLEK Examination Form. (2) Completely analyze the patient’s habitual contact lenses and enter the parameters on the CLEK Examination Form. Parameters to be analyzed are base curve radius, contact lens power, overall diameter, optic zone diameter, and center thickness. (3) Follow the protocol in Section 9.2 of this Operations Manual to determine the First Definite Apical Clearance Lens. (4) Enter the labeled base curve radii of each diagnostic lens applied and record the apical relationship and peripheral clearance in the spaces provided on the CLEK Examination Form.
2/22/96 Chapter 9 Contact Lens Fit Assessment page 9-8 (5) Photodocument the fluorescein patterns for the First Definite Apical Clearance Lens and the trial lens 0.2 mm flatter than the First Definite Apical Clearance Lens. (6) Enter the labeled base curve radii of the First Definite Apical Clearance Lens and the lens 0.2 mm flatter than FDACL in the boxes provided on the CLEK Examination Form. (7) Label and mail the exposed film of the fluorescein photographs to the CLEK Photography Reading Center within 24 hours: Dr. Joseph T. Barr CLEK Photography Reading Center Director The Ohio State University College of Optometry 338 West Tenth Avenue Columbus, Ohio 43210 (614) 292-9511 FAX (614) 688-3285
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