Fitting Guide
The PolyVue Presbyopic System represents the most versatile and complete soft lens fitting “system” for presbyopes.
The well-known benefits of aberration control technology in single vision lenses—better distance vision and range of accommodation—are now available in unique and versatile fitting system—the PolyVue Presbyopic System. Aberration reducing optics, in combination with toric and progressive geometries, optimizes the fitting of monovision, modified monovision, progressive and toric progressive soft contact lenses.
PRIOR TO FITTING
1. Determine the distance refraction, reading add and the dominant eye
2. Determine patient's spherical equivalent power and correct to the
corneal plane.
FITTING OF EMERGING PRESBYOPES AND
MONOVISION
When the add power is +1.00 diopter or less it is recommended to use High
Definition Aspheric lenses in both eyes and determine the initial lens power by
adding +0.50 to the patient’s spherical equivalent distance Rx.
For Monovision Fitting, it is recommended to use High Definition Aspheric lenses
and add +0.50 to the dominant eye spherical
equivalent distance Rx and half of the
add power to the non-dominant
spherical equivalent distance Rx.
HDX PROGRESSIVE FITTING GUIDE
Select the lens power closest to the patient's spherical equivalent distance Rx for each eye.
Confirm binocular far and near VA.
Make adjustments in power as necessary. The use of hand held trial lenses and over-refraction in ambient light is necessary to achieve accurate results.
>To improve DISTANCE:
Add minus in -0.25 steps to both eyes. If near vision becomes unacceptable
with this change, add minus to the dominant eye only. If no improvement
can be made, replace the dominant eye HDX Progressive lens with High Definition
Aspheric lens. ( See Modified Monovision Fitting Guide )
>To improve NEAR:
Add plus in +0.25 steps to both eyes. If distance vision becomes unacceptable with this change, add plus to the non dominant eye only.
MODIFIED MONOVISION FITTING GUIDE
Dominant Eye (HD): Select High Definition Aspheric lens and determine lens power by adding +0.50 to the patient's spherical equivalent distance Rx.
Non-Dominant Eye (HDX Progressive): Select HDX Progressive lens power closest to the patient's spherical equivalent distance Rx. Confirm binocular far and near VA.
Make adjustments in power as necessary. The use of hand held trial lenses and over-refraction in ambient light is necessary to achieve accurate results.
>To improve DISTANCE:
Add minus in -0.25 steps to both eyes. If near vision becomes unacceptable with this change, add minus to the dominant eye only. If distance vision can not be improved, replace the non-dominant eye also with High Definition Aspheric lens to fit monovision.
>To improve NEAR:
Add plus in +0.25 steps to both eyes. If distance vision becomes unacceptable with this change, add plus to the non dominant eye only.
PRESBYOPIC TORIC FITTING
High Definition Aspheric and HDX Progressive lenses are often effective
in correcting refractive cylinder of up to 0.75 diopters. For greater
cylinder correction, please call PolyVue and order toric lenses.