Orthokeratology and bi-focal contact lens

G - Physics – 02 – C

Patent

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G02C 7/04 (2006.01)

Patent

CA 2492132

A contact lens is fitted to a cornea of a patient's eye to gradually alter the patient's cornea during continued wear to reshape the cornea to reduce the hyperopia and/or presbyopia condition. The contact lens has a plurality of zones that includes one or two optical zones, a plateau zone, a fitting zone, an alignment zone and a peripheral zone. The one or more optical zones are utilized to redistribute cornea tissue to cause the cornea to have a steepened central portion surrounded by a flat mid-peripheral ring. The plateau zone helps steepening the central cornea by two ways : a positive molding effect of pushing the cornea tissue inward to pile up and a negative molding effect to flatten the mid-peripheral cornea for enhancing.

L'invention concerne une lentille de contact placée sur la cornée d'un patient pour modifier progressivement ladite cornée, en porter continu, afin de remodeler la cornée, de sorte à réduire l'état d'hyperopie et/ou de presbytie. Ladite lentille de contact comporte une pluralité de zones contenant une ou deux zones optiques, une zone de plateau, une zone d'adaptation, une zone d'alignement et une zone périphérique. La ou les zones optiques sont utilisées pour redistribuer le tissu de la cornée afin que la cornée présente une partie centrale à inclinaison accentuée, entourée d'une anneau médian-périphérique plat. La zone de plateau contribue à accentuer l'inclinaison de la cornée centrale de deux manières : un effet de moulage positif consistant à pousser le tissu de la cornée vers l'intérieur pour un effet d'empilement et un effet de moulage négatif pour aplatir la cornée médiane-périphérique en vue d'un renforcement.

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