Lens for increased depth of focus

Details Lens for increased depth of focus Lens for increased depth of focus

A - Human Necessities

61

F

A61F 2/16 (2006.01)

Patent

CA 2378621

An intraocular lens provides substantially increased depth of focus for accurate near and far vision with an optic (14) much thinner than a natural lens, and the lens being rigid, vaulted posteriorly and adapted for posterior positioning in the capsular bag (16). The optic is positioned substantially farther from the cornea (12) than a natural lens, so that a cone of light (3A) exiting the optic to impinge upon the retina is much smaller than a cone of light from a natural lens. Typically, the optic may be about 1.0 mm thick and its distance from the cornea 7.0-8.0 mm.

L'invention concerne un cristallin artificiel qui confère une profondeur de foyer sensiblement accrue pour assurer une vision de près et de loin précise, au moyen d'un élément optique (14) beaucoup plus mince qu'un cristallin naturel ; le cristallin artificiel est rigide, bombé vers l'arrière et conçu pour être placé vers l'arrière du sac capsulaire (16). L'élément optique est placé sensiblement plus loin de la cornée (12) qu'un cristallin naturel, de sorte qu'un cône (3A) de lumière sortant de l'élément optique et touchant la rétine est beaucoup plus petit qu'un cône de lumière provenant d'un cristallin naturel. Généralement, l'élément optique présente environ 1,0 mm d'épaisseur et la distance le séparant de la cornée est de 7,0-8,0 mm.

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