Contact lens with shaped periphery

Details Contact lens with shaped periphery Contact lens with shaped periphery

G - Physics

02

C

G02C 7/02 (2006.01)

Patent

CA 2523790

Eye measurements taken on a patient being fitted for contact lens will include a refraction test and an additional measurement representing corneal depth variation on the surface of an imaginary cylinder having the same diameter as the lens. This information then used during lens manufacture to produce lens in which the perimeter is not circular and does not lie in a plane, but which drops backwards towards the eye at appropriate points to produce a saddle- shaped perimeter.

Selon l'invention, des mesures oculaires prises sur un patient destinées au port de lentilles de contact comprennent un test de réfraction et une mesure supplémentaire qui représente la variation de profondeur de la cornée sur la surface d'un cylindre imaginaire présentant le même diamètre que celui de la lentille. Ces informations sont ensuite utilisées pendant la fabrication de la lentille dont le périmètre n'est pas circulaire et ne s'étend pas dans un plan, mais qui est orienté vers l'arrière en direction de l'oeil au niveau de points appropriés de manière à produire un périmètre en forme de selle.

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