Progressive multifocal rigid gas permeable contact lens

摘要

A contact lens is provided. It is a rigid gas permeable, corneal-scleral progressive, multifocal, vision lens that covers the cornea and a portion of the sclera of an eye. It is particularly beneficial for use on patients who have undergone refractive surgery and/or on patients experiencing presbyopia. The lens is designed to have dual touch contact with an eye. One contact point is the central portion of the cornea and the other contact point is a portion of the sclera.

主权项

1. A rigid gas permeable progressive corneal-scleral contact lens for use on an eye, the eye comprising a cornea, a limbus, and a sclera, the rigid gas permeable progressive corneal-scleral lens comprising:
a daily use rigid gas permeable continuously progressive corneal-scleral contact lens having sufficient lens diameter to cover the cornea and a portion of the sclera of an eye while bridging the limbus of the eye, the posterior surface of the rigid gas permeable continuously progressive corneal-scleral lens being in significant contact with the central portion of the cornea and a portion of the rigid gas permeable continuously progressive corneal-scleral lens in contact with a portion of the sclera providing a distributed bearing area for the lens; an anterior surface of the rigid gas permeable continuously progressive corneal-scleral lens having a continuously progressive multifocal segment being an aspheric central zone providing continuously progressive near and intermediate vision correction to the eye; and a spherical portion of the rigid gas permeable continuously progressive corneal-scleral lens to provide distance vision, adjacent the aspherical central zone of the rigid gas permeable continuously progressive corneal-scleral, and; the rigid gas permeable continuously progressive corneal-scleral lens provides a center aspheric addition to produce a true continuously progressive rigid gas permeable contact lens that gives continuous vision correction between near, intermediate, and distance vision zones of the eye.