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Contact lens with high-order compensation for non-axisymmetric structure

A contact lens, non-axisymmetric technology for optical modification of eyeglasses and devices that addresses issues such as degraded imaging performance

Inactive Publication Date: 2008-12-10
BAUSCH & LOMB INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in addition to small shifts in focus position, controlled thickness changes also tend to produce higher-order aberrations, especially vertical coma (coma), which is a third-order effect
Such higher-order aberrations degrade imaging performance, especially in lower light conditions

Method used

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  • Contact lens with high-order compensation for non-axisymmetric structure
  • Contact lens with high-order compensation for non-axisymmetric structure
  • Contact lens with high-order compensation for non-axisymmetric structure

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Embodiment Construction

[0025] Multifocal and toric contact lenses are among the types of contact lenses that require relative angular orientation to function as designed. Such angled sensitive contact lenses are typically formed with some type of ballast to induce a specific orientation of the lens on the wearer's eye. Ballasting sets the intermediate angular orientation of the eyeglasses; and angle-sensitive prescriptions, such as the angular orientation of the cylindrical axis used to accommodate astigmatism, are directed to this orientation.

[0026] Typically, spectacles are manufactured with thickness variations along a so-called ballast axis, which sets the medial direction of the spectacles. Such as figure 1 and 2As shown in , the thickness variation of a typical toric contact lens 10 can be achieved by the relative vertical offset of the front lens surface 12 relative to the rear lens surface 14 . This offset affects the central regions 16 and 18 of the front eyeglass surface 12 and the r...

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Abstract

Contact lenses, such as prism ballasted toric lenses, having anterior and posterior surfaces related by way of non-axisymmetric thickness variation can exhibit a third-order aberration, particularly vertical coma. A wavefront modifier, such as an aspheric surface modification, is incorporated into the lenses to at least partially compensate for the wavefront aberration associated with the non-axisymmetric thickness variation. A magnitude of the modifications can be adjusted to set a target value for any remaining wavefront aberration of the lenses based on a population-wide goal.

Description

technical field [0001] The present invention relates to contact lenses and other ophthalmic biomedical devices incorporating asymmetric structural features, such as prism ballast, and to optical modifications to such lenses and devices to compensate for associated optical aberrations. Background technique [0002] Optical correction for conditions such as hyperopia and astigmatism involves a specific angular orientation about the optical axis of vision. Stacked focal segments for treating hyperopia have different powers spaced along a common vertical axis. Cylindrical optical corrections for the treatment of astigmatism are characterized by two orthogonal directions oriented relative to a common cylinder axis. Optical power in two orthogonal directions oriented about a common cylindrical axis. In order to achieve the desired optical correction, the vertical axis of the hyperopia correction and the cylindrical axis of the astigmatism correction must be oriented at an angle ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02C7/04
CPCG02C7/028G02C7/04G02C7/048G02C2202/08G02C2202/22
Inventor G·E·阿尔特曼I·G·考克斯T·格林W·T·赖因德尔
Owner BAUSCH & LOMB INC