Contact lens for correction of irregular astigmatism

A contact lens, irregular technology, applied in optics, optical components, glasses/protective glasses, etc., can solve the problems of difficult visual quality, impossible to avoid processing technical problems, manufacturing cost, unstable visual quality, etc., to avoid wearing The effect of comfort

Active Publication Date: 2013-01-09
MENICON CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, even if the optical characteristics to correct irregular astigmatism for each individual with high precision can be given together with the positioning mechanism that specifies the circumferential stop position in the wearing state, the visual quality is not stable because it is impossible to completely control the contact lens displacement
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Method used

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  • Contact lens for correction of irregular astigmatism
  • Contact lens for correction of irregular astigmatism
  • Contact lens for correction of irregular astigmatism

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Embodiment Construction

[0078] Hereinafter, we will describe embodiments of the present invention with reference to the accompanying drawings.

[0079] First, the wavefront sensor itself is known, but since the present invention is an item using information obtained using the wavefront sensor, not only when the fundamental discovery of the present invention is obtained but also when the effect of the present invention is determined, we will A summary description of the principle of the wavefront sensor and the information obtained is given to facilitate the understanding of the invention.

[0080] In particular, the refractive state of the eye's optical system, including the spherical power and astigmatism (including the astigmatism axis) that can be corrected by glasses, and the irregular astigmatism that cannot be completely corrected by glasses, can be represented by the concept of wavefront aberration. The state in which parallel rays of light emanating from each point on the surface perpendicula...

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Abstract

Disclosed is the implementation of new technology for effectively providing a contact lens capable of achieving satisfactory corrective effects even with respect to irregular astigmatism (residual irregular astigmatism) caused by a conical cornea and so forth, which could not be corrected with conventional eye glasses or contact lens, wherein said contact lens is not dependent on being made to order for each wearer but is industrially mass-producible by means of a practical and novel structure. A contact lens for correcting irregular astigmatism is disclosed wherein a positive correction area (27) is provided on one side of a special radial line (30) and a negative correction area (28) is provided on the other side while in any of the correction areas (27, 28) the lens power is configured so that the absolute value becomes progressively larger from the peripheral edge portion towards the central portion.

Description

technical field [0001] The present invention relates to contact lenses for correcting irregular astigmatism caused by keratoconus and the like. Background technique [0002] In the past, prescription lenses and contact lenses were used for refractive errors of the eye. These eyeglasses and contact lenses are prescribed by correcting the optical properties of the wearer's eyes to provide good vision. In particular, using contact lenses, various types of research are advancing to achieve better vision, and many structures have been proposed since the past, for example, with the aim of improving positional stability in the circumferential direction, such as when correcting astigmatism or hyperopia, for example performance, achieve bifocal optical properties when correcting hyperopia, improve comfort when worn, etc. One of the inventors of the present invention also discloses in Japanese Patent No. 3870219 (Patent Document 1) a contact lens equipped with a series of combinatio...

Claims

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Application Information

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IPC IPC(8): G02C7/04G02C13/00
CPCG02C2202/22G02C2202/08G02C7/04G02C7/047
Inventor 洲崎朝树后藤裕二前田直之
Owner MENICON CO LTD
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