PROGRESSIVE LENSES

摘要

A method comprising: performing eye exam to a subject having a first and second eye; determining a prescription for the first and second eyes, the prescription describing focal power for each of the first eye and the second eye for at least three distances; and providing the prescription to a machine that produces progressive glasses that comprise a first and second lenses, wherein the first and second lenses each having at least three focal portions associated with the at least three distances that are located in a same height in the glasses thereby enabling clear vision for the subject in the first eye and the second eye with respect to the at least three distances.

主权项

1. A method comprising:
having a description of a lens adapted for an eye, wherein the lens comprising a first focal portion associated with a first distance and a second focal portion associated with a second distance, and wherein the lens comprising an intermediate portion having gradient change in optical power between a first power and a second power associated with the first and second focal portions respectively; identifying, based on a prescription for the eye, an intermediate focal portion associated with an intermediate distance, wherein the intermediate distance is between the first and second distances; and planning a counterpart lens adapted for a counterpart eye based upon focal power required by the counterpart eye to achieve focus at the first distance, the second distance and the intermediate distance, wherein the counterpart lens comprising a first, a second and an intermediate focal areas, wherein the first, second and intermediate focal areas are located in locations parallel to locations of the first, second and intermediate focal portions, respectively, wherein the counterpart lens comprising a first gradient change in optical power between the first and intermediate focal areas and a second gradient change in optical power between the intermediate and second focal areas.