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Displaying items by tag: lenses

Subjective Refraction: A new vectorial method for determining the cylinder 3/3Click here to read the article

The refraction technique traditionally used to determine the corrective cylinder for a prescription has changed very little over the years, mainly due to the limitations imposed by subjective phoropters, which present lenses in increments usually no smaller than 0.25 D.
Today, thanks to phoropters with continuous power changes that allow to simultaneously and accurately act on sphere, cylinder and axis, it is now possible to develop new refraction techniques. This series of three articles describes the principles of a new vectorial method for determining the corrective cylinder and presents the rationale for an associated automated cylinder search algorithm.

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Article from the magazine "Point de vue"

points de vue

Published in Optometry

Subjective Refraction: A new vectorial method for determining the cylinder 2/3Click here to read the article

The refraction technique traditionally used to determine the corrective cylinder for a prescription has changed very little over the years, mainly due to the limitations imposed by subjective phoropters, which present lenses in increments usually no smaller than 0.25 D.
Today, thanks to phoropters with continuous power changes that allow to simultaneously and accurately act on sphere, cylinder and axis, it is now possible to develop new refraction techniques. This series of three articles describes the principles of a new vectorial method for determining the corrective cylinder and presents the rationale for an associated automated cylinder search algorithm.

READ THIS ARTICLE...


Article from the magazine "Point de vue"

points de vue

Published in Optometry

Subjective Refraction: A new vectorial method for determining the cylinder 1/3Click here to read the article

The refraction technique traditionally used to determine the corrective cylinder for a prescription has changed very little over the years, mainly due to the limitations imposed by subjective phoropters, which present lenses in increments usually no smaller than 0.25 D.
Today, thanks to phoropters with continuous power changes that allow to simultaneously and accurately act on sphere, cylinder and axis, it is now possible to develop new refraction techniques. This series of three articles describes the principles of a new vectorial method for determining the corrective cylinder and presents the rationale for an associated automated cylinder search algorithm.

READ THIS ARTICLE...


Article from the magazine "Point de vue"

points de vue

Published in Optometry
Tuesday, 19 January 2021

Refraction : Vertex distance matters!

Refraction : Vertex distance matters!Click here to read the article

Although the effect of vertex distance on optical correction is well known, it is rarely taken into account in practice, except in cases of very strong corrections. When ophthalmic lenses were offered only in 0.25 D increments, this had little influence on most corrections.
But today, with refraction determined in 0.01 D increments* and the lenses associated with them, knowledge and measurement of vertex distance becomes particularly important. This article reviews the optical effects of vertex distance, shows how eye-to-phoropter distance can vary and discusses how vertex distance can now be taken into account for an accurate calculation of corrective lens power.

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Article from the magazine "Point de vue"

points de vue

Published in Optometry

Study satisfaction of people who wear progressive lenses conducted in optical storesClick here to read the article

Fitting progressive lenses on a person with presbyopia is a complex technical act that requires know-how, experience and psychology. The success of a fitting depends on a chain of actions that can each be a source of inaccuracy. In a large study conducted in France with Les Opticiens J. Torrilhon, we have evaluated the satisfaction levels of people wearing Varilux® progressive equipment. This article presents the various results that we have obtained and offers an analysis of them.

 

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Article from the magazine "Point de vue"

points de vue

Published in Optometry
Tuesday, 15 January 2019

A low vision magnification breakthrough

A low vision magnification breakthroughClick here to read the article

For people suffering from low vision today, it often takes tenacity and perseverance to find an optical solution that allows them to optimize their remaining sight. Meg Zatorski knows this only too well. Afflicted with Stargardt disease (a common form of inherited juvenile macular degeneration), she spent a decade trying to obtain powerful enough high plus lenses to enable her to regain the ability to read. Essilor’s Stanislas Poussin and Anne-Catherine Scherlen recount how her challenge was met and what needs to be done so others like her can benefit from a solution that meets their visual needs.

 

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Article from the magazine "Point de vue"

points de vue

Published in Optometry

Single vision lenses with additional near powerClick here to read the article

Life in modern societies is increasingly digitalized. The increase in near-point activities brought on by the widespread use of all kinds of digital devices is triggering a notable increase in the visual fatigue syndrome known as digital eye strain (DES), accommodative and vergence dysfunctions and dry eye. As practitioners, we must face this challenge – which represents nothing less than the digital Everest for our eyes – with concrete solutions for real life. Single vision lenses with additional near-power is an example of one such solution we are using to treat a number of clinical cases. In this review, we are going to share what we are busy doing to resolve this challenge.

 

 

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Article from the magazine "Point de vue"

points de vue

Published in Optometry