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Using higher order mathematical functions to create asymmetric molding back pieces

A mathematical function, high-level technology, applied in the field of using high-level mathematical functions to form asymmetric molded back pieces, which can solve problems such as image blur and visual damage, achieve roughly uniform thickness, optimize fluidity, and minimize optical distortion Effect

Inactive Publication Date: 2007-07-25
NOVARTIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These higher order aberrations blur the image formed on the retina, which impairs vision

Method used

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  • Using higher order mathematical functions to create asymmetric molding back pieces
  • Using higher order mathematical functions to create asymmetric molding back pieces
  • Using higher order mathematical functions to create asymmetric molding back pieces

Examples

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Embodiment Construction

[0015] Hereinafter, a reference description will be made in detail to the embodiments of the present invention. It will be apparent to those skilled in the art that various modifications and amendments can be made in the present invention without departing from the scope or spirit of the inventions. For example, features illustrated or described as part of one embodiment can be used with another embodiment to yield a new embodiment. Thus, it is intended that the present invention covers the modifications and changes that come within the scope of the appended claims and their equivalents. Additional objects, features and aspects of the present invention will be disclosed in or be apparent from the following detailed description. Those of ordinary skill in the art will appreciate that this is a description of exemplary embodiments only and should not be taken as limiting the broader aspects of the invention.

[0016] related definition

[0017] Unless defined otherwise, all t...

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Abstract

This invention is related to creation of a mold for an ophthalmic lens using higher order mathematical functions, such as non-uniform rational b splines (NURBs), to create surfaces that do not contact fluid optical material, such as molding back pieces. In particular, the present invention optimizes the flow of mold material. Additionally, use of the present invention creates substantially uniform thickness of the mold, minimizing optical distortions.

Description

technical field [0001] The present invention involves forming molds for ophthalmic lenses using high order mathematical functions, such as non-uniformity rational b-splines (NURB), to form surfaces that do not contact fluid optical materials, such as molded backplates. In particular, the invention optimizes the flowability of the molding material. In addition, with the present invention, the mold can be obtained with a substantially uniform thickness, and optical distortion is minimized. Background technique [0002] Contact lenses are widely used to correct various types of visual defects. Current contact lens surface designs are relatively simple, usually using rotational symmetry or toric surfaces, and can correct low-order aberrations of the human eye, such as defocus and astigmatism. More complex contact lenses can be used to correct higher-order monochromatic aberrations of the human eye, such as non-normalized spherical aberration, coma, and other irregular higher-o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29D11/00
CPCB29D11/00125B29D11/0048
Inventor S·肯迪格C·D·尼古拉斯M·叶D·A·霍尼亚
Owner NOVARTIS AG