LENS SYSTEM FOR PRESBYOPES WITH INTER-EYE DISPARITY LIMITS

摘要

A lens system for presbyopes utilizes inter-eye disparity limits to improve vision. The system of lens may be utilized to improve binocular vision when viewing distant, intermediate and near objects by requiring a minimal level of disparity in vision between the eyes wherein the level is not objectionable to the patient. This disparity in vision depends on the lens design for each eye and upon how the lenses are fit in each eye relative to the distance refraction of the patient.

主权项

1. A lens system for presbyopes with inter-eye vision disparity limits, the lens system comprising:
a fit guide specifying lens design choice and lens fit by add need; and a group of lenses including multiple designs, each of the designs having a range of refractive powers, wherein for each lens design choice and fit specified in the fit guide, the visual disparity, Δ, falls within the range defined by Δ>0.2*add+0.2 and Δ<0.7*add+0.5.