Contact lenses

摘要

A set of contact lenses having peripheral zones with optical power parameters determined in relation to the optical powers of the central portions of the lenses. In a specific embodiment, an optical parameter assigned to a given peripheral zone of a lens from the set represents a difference between an optical power of the lens in such peripheral zone and an optical power of the lens in the central portion. A method for determining optical parameters of such set of lenses and an apparatus implementing such determination based on imaging data acquired as a result of imaging an eye and generation of a representation of the lenses at least in part of such imaging data.

主权项

1. A set of contact lenses, each lens in the set comprising:
a differentiable posterior surface including a posterior optical zone (POZ) having a POZ diameter and a normal to a surface of the POZ passing through a center of the POZ; at least five peripheral zones (PZs) each of which encircles said POZ and has corresponding inner and outer perimeters, wherein immediately adjacent peripheral PZs from said at least five annular PZs share a perimeter, the at least five PZs having respectively corresponding optical power parameters that define slopes of the posterior surface with respect to the normal; and a POZ optical power of the lens corresponding to the POZ and common among the lenses in the set; wherein the set of contact lenses comprises first and second lenses, each of the first and second lenses having a corresponding POZ optical power equal to about −3.0 diopters, a corresponding POZ diameter equal to about 6.5 mm, a lens diameter of about 9.0 mm, a base curve parameter of about 7.85, an eccentricity parameter of about 0.2, a center thickness of about 0.14 mm, and an edge thickness of about 0.11 mm; wherein first, second, third, fourth, and fifth PZs have respective optical power parameters of about −0.5, 0.5, 1.25, and 2.50, the first PZ being immediately adjacent to the POZ,
said first, second, third, fourth, and fifth PZ having progressively larger outer diameters; wherein the first lens is adapted to have the POZ optical power of the first lens vary from about −3.0 diopters at a radius of about 3.1 mm from a center of the first lens to about 0.25 diopters at an edge of the POZ of the first lens; and wherein the second lens is adapted to have the POZ optical power of the second lens vary from about −3.0 diopter at a radius of about 2.9 mm from a center of the second lens to about 0.25 diopters at an edge of the POZ of the second lens.