Lens Design Techniques to Improve Satisfaction in Free-Form Progressive Addition Lens Users

Eva Chamorro

doi:10.19080/jojo.2018.06.555688

Abstract

Lens Design Techniques to Improve Satisfaction in Free-Form Progressive Addition Lens Users

Highlights

The introduction of Free-Form technology has brought new ways of calculating progressive lens designs, offering a wider range of lenses using different design technologies
Personalization of Free-Form lenses according to personalization parameters, the use of a variable base curve that increases in curvature from the top to the bottom of the lens and control of mean power in the lateral areas of the progressive lens are good and valid techniques to improve general satisfaction of Free-Form progressive addition lenses users
The continuous increment of power from the top part of the lens used for far vision to the bottom part of the lens used for near vision introduces unwanted astigmatism as explained by the Minkwitz theorem [2]

Summary

Introduction

The introduction of Free-Form technology has brought new ways of calculating progressive lens designs, offering a wider range of lenses using different design technologies. With Free-Form technology the back surface of the lens can be generated pointby-point allowing the generation of arbitrary surfaces Using this production technology allows the design providers to calculate lenses based on the individual needs of each user [1]. The continuous increment of power from the top part of the lens used for far vision to the bottom part of the lens used for near vision introduces unwanted astigmatism as explained by the Minkwitz theorem [2]. This lateral astigmatism cannot be avoided, it can be distributed in the lateral parts of the lenses according to some geometric rules. The main goal of lens designers is to use this flexibility to improve visual quality, ease of adaptation, etc., or in other words, improve the overall satisfaction of the user

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