Progressive lens

Details Progressive lens Progressive lens

G - Physics

02

C

G02C 7/06 (2006.01) G02C 7/02 (2006.01)

Patent

CA 2386062

A progressive ophthalmic lens including a far vision zone, a near vision zone and an intermediate vision zone is provided having a relatively high, relatively wide near vision zone and a relatively wide intermediate zone. A surface correction(s) for reducing optical aberrations in peripheral regions of the lens may be provided within a pair of generally horizontally disposed opposed segments approximately .plusmn.22.5~ above and below a generally horizontal axis passing through a fitting cross. Two or more progressive ophthalmic lenses differing in prescribed addition power may be placed in series to provide a range of distance prescriptions for one or more of emmetropes, hyperopes and myopes. A method of designing the progressive ophthalmic lens is also disclosed.

L'invention concerne une lentille ophtalmique progressive comprenant une zone de vision de loin, une zone de vision de près et une zone de vision intermédiaire, possédant une zone de vision de près relativement haute et large et une zone de vision intermédiaire relativement large. Une correction de surface, destinée à réduire les aberrations optiques dans les régions périphériques de la lentille peut se trouver au sein d'une paire de segments opposés généralement horizontaux, environ .plusmn.22,5· au-dessus et en dessous d'un axe généralement horizontal traversant une croix centrale. On peut placer en série au moins deux lentilles ophtalmiques progressives ayant des puissances d'addition prescrites différentes, afin d'obtenir une gamme de distances prescrites pour un ou plusieurs emmétropes, hypermétropes et myopes. L'invention concerne également un procédé de conception de la lentille ophtalmique progressive.

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