A - Human Necessities – 61 – F
Patent
A - Human Necessities
61
F
A61F 2/14 (2006.01)
Patent
CA 2694840
The invention relates to a lens that can be implanted in the cornea for correcting vision defects, such as presbyopia. It consists of a zonal diffractive lens with phase inversion that comprises an alternation of optically active or full annular areas (2) and of optically inactive or empty annular areas (3) which are all concentric. The empty annular areas (3) are filled with an optically inactive cement that binds together the full annular areas (2) in order to ensure the stability thereof. The cement is a hydrogel pervious to nutrients and oxygen having an optical index close to that of the cornea.
Cette lentille est implantable dans la cornée pour la correction de défauts de la vision, tels que la presbytie. Il s'agit d'une lentille diffractive zonale avec inversion de phase qui comporte une alternance de zones annulaires optiquement actives ou <= pleines >= (2) et de zones annulaires optiquement inactives ou <= vides >= (3), toutes concentriques. Les zones annulaires <= vides >= (3) sont occupées par un <= ciment >= optiquement inactif qui relie entre elles les zones annulaires <= pleines >= (2), pour assurer leur stabilité. Le <= ciment >= est un hydrogel perméable aux nutriments et à l'oxygène, et d'indice optique proche de celui de la cornée.
Cohen Gilbert
Robic
LandOfFree
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