Progressive lens

Details Progressive lens Progressive lens

G - Physics

02

C

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

Patent

CA 2375162

A progressive ophthalmic lens element including a lens surface having an upper viewing zone having a surface power corresponding to distance vision, a lower viewing zone having a greater surface power than the upper viewing zone to achieve a refracting power corresponding to near vision; and an intermediate zone extending across the lens element having a surface power varying from that of the upper viewing zone to that of the lower viewing zone and including a corridor of relatively low surface astigmatism; the corridor exhibiting a power progression from that of the upper viewing zone to that of the threshold of the lower viewing zone, the corridor and lower viewing zone exhibiting a power progression profile having at least two segments the slopes of which related at least in part to the prescribed addition power and/or the depth of focus of the wearer.

Selon cette invention, un élément de verre ophtalmologique progressif comprend une surface de lentille possédant ce qui suit: une zone de vision supérieure dont la puissance en surface correspond à la vision à distance, une zone de vision inférieure possédant une plus grande puissance en surface que la zone de vision supérieure, et ce pour obtenir une puissance de réfraction qui correspond à la vision proche; et une zone intermédiaire qui s'étend à travers l'élément de lentille qui possède une puissance en surface variant entre celle de la zone de vision supérieure et celle de la zone de vision inférieure et comprend un corridor ayant un astigmatisme de surface relativement bas; le corridor manifeste une progression de puissance depuis la zone de vision supérieure jusqu'au seuil de la zone de vision inférieure, le corridor et la zone de vision inférieure manifestant un profil de progression de puissance qui comporte au moins deux segments dont les pentes sont liées au moins partiellement à la puissance d'addition prescrite et/ou la profondeur du foyer de l'utilisateur.

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