METHOD OF FITTING CONTACT LENSES
First Claim
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1. A contact lens fitting method, comprising the steps of:
- a.) obtaining baseline measurements of low order aberration data;
low order manifest subjective data;
high order spherical aberrations resulting from the crystalline lens;
corneal data; and
visual requirements or an individual;
b.) determining a difference between the lower order aberrations and the lower order manifest subjective refraction obtained in carrying out the baseline measurements in step a.);
c.) fitting at least a first trial aspheric lens on an eye of the individual, wherein the first trial lens is selected based on the low order aberrations and the crystalline lens spherical aberrations less a corneal Qv;
d.) carrying out a contrast sensitivity function measurement of the first trial lens;
e.) obtaining a second contrast sensitivity function measurement that takes into account the difference between the low order aberration data and the low order manifest subjective data;
f.) calculating the difference between the first and second contrast sensitivity function measurements; and
g.) selecting an aspheric lens for the individual based on the following equation;
(low order manifest subjective refraction+crystalline lens spherical aberrations)−
Qv+CSAwherein CSA is a cortical spherical aberration.
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Abstract
The invention provides a method of fitting lenses that results in correction of not only low and high order ocular aberrations, but that additionally provides correction for the effects of cortical influences, or neuro-adaptive influences.
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Citations
7 Claims
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1. A contact lens fitting method, comprising the steps of:
- a.) obtaining baseline measurements of low order aberration data;
low order manifest subjective data;
high order spherical aberrations resulting from the crystalline lens;
corneal data; and
visual requirements or an individual;
b.) determining a difference between the lower order aberrations and the lower order manifest subjective refraction obtained in carrying out the baseline measurements in step a.);
c.) fitting at least a first trial aspheric lens on an eye of the individual, wherein the first trial lens is selected based on the low order aberrations and the crystalline lens spherical aberrations less a corneal Qv;
d.) carrying out a contrast sensitivity function measurement of the first trial lens;
e.) obtaining a second contrast sensitivity function measurement that takes into account the difference between the low order aberration data and the low order manifest subjective data;
f.) calculating the difference between the first and second contrast sensitivity function measurements; and
g.) selecting an aspheric lens for the individual based on the following equation;
(low order manifest subjective refraction+crystalline lens spherical aberrations)−
Qv+CSAwherein CSA is a cortical spherical aberration. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- a.) obtaining baseline measurements of low order aberration data;
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