Lens with continuous power gradation

Abstract

The present invention is embodied in ophthalmic lenses having a first lens surface that is described by a continuous, gradual increase in optical power that proceeds without inflection points of discontinuities across substantially the entire useable optical area of this lens surface, and an opposite surface of the lens configured to cooperate with the power gradation of the first surface to provide a desired prescription, including at least one stabilized area of optical power. The power gradation of the first surface increases from one edge of the useable area to substantially the opposite edge, and may increase according to linear or non-linear relationships. In another preferred embodiment, the two lens surfaces cooperate to create two stabilized areas of optical power, for a prescription with near-viewing and distance-viewing values.

Description

Background technique [0001] Spectacle lenses that correct human vision have been used for centuries. Nonetheless, new developments in materials and optical design continue to provide lens wearers with more choices and improvements. [0002] As an example, consider the age-related developmental history of reduced focus adaptation—a common phenomenon of "reading glasses" as one becomes older. The lens of the eye is housed within an intricate framework of muscles and fibers, and is flexible enough to change into a new shape through the contraction and relaxation of the muscles and fibers. Thus, the action of the muscles and fibers changes its shape and thus the focal length of the lens of the eye. The "resting state" is used for farsightedness, when the muscles are relaxed and the lens is in a less curved configuration for longer focal lengths. With nearsightedness, the muscles tighten and the lens becomes more rounded, allowing it to focus on near objects. When a person look...

AI Technical Summary

Problems solved by technology

[0016] Sharing optics between the two surfaces provides significantly more options for thickness and optic profile, but significantly increases design complexity, requiring more cost, time, and resources to prepare the final lens

Also, depending on how the different parts of the prescription power are distributed, there are still issues such as increased thickness on the inner surface (resulting in contact with the face or the wearer's eyelashes), excessive curvature on the frontal surface, and added weight to the lens

Images