User Manual
Table Of Contents
- Professional Fitting Guide
- Introduction
- Description of the Lenses
- Lens Parameter Availability*
- Actions
- Indications
- Contraindications (Reasons Not to Use)
- Warnings
- Precautions
- Adverse Effects
- Patient Selection
- Fitting Procedures for Frequency 55 Toric Contact Lens
- Diagnostic Criteria
- Monovision Fitting Guidelines
- Diagnostic Lens Care
- Wearing Schedule
- Follow-Up Care
- Patient Lens Care Directions
- Recommended Lens Care Products
- Care for a Dried Out (Dehydrated) Lens
- Care for a Sticking (Non-Moving) Lens
- Emergencies
- How Supplied
- Reporting of Adverse Reactions
Part Number: PFG01017 Page 9 of 17
Revision A Revision Date: July 2016
Lens Positioning
Perfect geometric centering of the lens is not always possible or necessary, and in some instances can only be
achieved with a lens which is too tight. The important consideration in evaluating positioning is corneal coverage. If
a lens is somewhat decentered, positioning is satisfactory when the entire cornea, including the corneal periphery
opposite to the decentration, is completely covered by the lens.
Instrumentation
Slit Lamp
a. Bubbles under the lens indicate that the fit is too tight.
b. There should be no impingement of the lens edge on the sclera, which can be seen either as scleral
indentation or by a blanching of the scleral blood vessels. When there is pressure on the sclera, the fit
is almost certainly too tight, and tight symptoms will usually develop if a lens with a flatter base curve is
not used.
Keratometer (readings taken with the lens in place on the eye)
a. Mire Quality
• A clear and constant image indicates a proper fit.
• Any blurring or distortion of the mires may indicate a poor fit.
• CAUTION: On occasion the mires may be blurred de to some drying out of the anterior surface or
mucus on the surface. Whenever mire distortion or blurring is found, have the patient blink rapidly
and completely six or more times and recheck. If the mires are still distorted, then lenses of a
flatter base curve should be tried.
Retinoscope
a. The reflex through a properly fitted lens should be clear and indistinguishable from the reflex without a
lens in place.
b. A darkish or irregular area in any part of the reflex may indicate a lens which is not fitting properly.
The patient may not have the best possible vision if results with keratometry and retinoscopy are less than
optimal.
Monovision Fitting Guidelines
1. Patient Selection
A. Monovision Needs Assessment
For a good prognosis the presbyopic patient should have adequately corrected distance and near visual acuity
in each eye. The amblyopic patient may not be a good candidate for monovision.