Hybrid contact lens

摘要

A hybrid contact lens has a rigid gas permeable (RGP) central portion and a soft flexible portion that extends outward from the RGP central portion. The soft flexible portion defines the posterior surface and base curve of the hybrid contact lens that contacts a user's cornea, such that the RGP central portion does not contact the user's cornea while wearing the hybrid contact lens. The hybrid contact lens can be a single lens system with one optical power, or a dual lens system with two different optical powers.

主权项

1. A hybrid contact lens, comprising:
a lens body having
a rigid gas permeable (RGP) portion disposed generally at the center of the lens body, the RGP portion having a posterior surface defined by a base curve; anda flexible portion extending outwardly from the RGP portion and defining an outer edge of the lens body,wherein the flexible portion extends over the posterior surface of the RGP portion and defines a posterior surface and base curve of the lens body configured to contact a user's eye when wearing the hybrid contact lens, such that the RGP portion does not contact the user's eye when wearing the hybrid contact lens, andwherein a ratio of a thickness of the RGP portion relative to a thickness of a section of the flexible portion disposed over the posterior surface of the RGP portion is between and including 2.1 to 1 and 5.8 to 1.