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Method and a device for measuring the power of an ophthalmic lens by combined feeling and contactless overall measurement

A measurement method and focal power technology, which is applied in the direction of measuring devices, refractive power measurement, and optical performance testing, and can solve problems such as poor accuracy performance and insufficient accuracy.

Active Publication Date: 2007-11-07
ESSILOR INT CIE GEN DOPTIQUE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the main disadvantage of this measuring device is that its accuracy is insufficient, especially when measuring local optical powers
Significantly poorer performance in terms of accuracy, especially compared to front focal length meter type devices that perform local measurements through the end piece

Method used

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  • Method and a device for measuring the power of an ophthalmic lens by combined feeling and contactless overall measurement
  • Method and a device for measuring the power of an ophthalmic lens by combined feeling and contactless overall measurement
  • Method and a device for measuring the power of an ophthalmic lens by combined feeling and contactless overall measurement

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Experimental program
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Embodiment Construction

[0075] Components for automatic preparation equipment

[0076] As shown more particularly in Figures 1 and 2, the device 1 of the invention for preparing lenses to be mounted comprises a number of subassemblies mounted on a common frame:

[0077] Measuring device 5 for automatic measurement of lenses L1 and L2 (which may be, for example, single-focal lenses, multi-focal lenses with discontinuous powers of near or intermediate vision zones, or true multi-focal lenses with progressive powers) various properties of the lens, in particular, for measuring the partial lens power at a particular point, such as the optical center of a single vision lens or reference points for far and near vision, and for measuring at least one identifying characteristic, such as a fixed Localization of centroid, axial orientation, or reference points for myopia and hyperopia of the lens;

[0078] The cutting device 6 is used to cut and shape the lens;

[0079] Combined receiving and first and secon...

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Abstract

The invention concerns a method comprising a step of contact-free optical measuring of the local value of at least one optical refraction characteristic of said lens on a local zone delimited about said measuring point of the lens, at least one step of tracing said lens during which the axial position of said measuring point on one of the sides of the lens is determined; combining the axial position of the measuring point obtained by tracing with the local value of the lens optical characteristic at the measuring point determined on the basis of the contact-free optical measurement, to deduce therefrom at least one front optical power of the lens in that measuring point.

Description

technical field [0001] The present invention relates generally to mounting lenses of a pair of vision correcting eyeglasses in a frame, and more particularly, to a method and apparatus for preparing lenses of a pair of eyeglasses to be fitted into a frame selected by a user, and includes a Probe devices are devices that combine to perform an overall non-contact optical measurement of the local optical properties of the lens. Background technique [0002] Measuring devices are known, working either automatically or manually, for measuring and checking various properties of monofocal or progressive addition lenses by carrying out an optical analysis without contact, before or after the lens is mounted on the frame, In particular its power and centering or identifying properties to produce a holistic map. In particular, one such device is known from the document French patent 2 825 466 (which is equivalent to US patent 2003 / 0015649 published on January 23, 2003). In such a me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02
CPCG01M11/0214G01M11/0228G01M11/0257G01M11/02G01M11/00
Inventor F·迪沃
Owner ESSILOR INT CIE GEN DOPTIQUE
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