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Phoropter, and method for measuring refraction using phoroptor of said type

一种光测定、光轴的技术，应用在综合屈光检查仪、测试眼睛的设备、光学等方向，能够解决不适合近距视觉矫正等问题

Active Publication Date: 2015-10-14
ESSILOR INT CIE GEN DOPTIQUE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Such devices are therefore not suitable for precisely establishing the near vision correction required by the patient

Method used

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  • Phoropter, and method for measuring refraction using phoroptor of said type
  • Phoropter, and method for measuring refraction using phoroptor of said type
  • Phoropter, and method for measuring refraction using phoroptor of said type

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Embodiment Construction

[0043] figure 1 The main optical elements of an exemplary vision compensating device for use in a refractometer according to the teachings of the present invention, as described below, are schematically shown.

[0044] These optics consist of a cylindrical power C 0 A plane-cylindrical convex lens 2, a negative cylindrical refractive power-C 0 The plane-cylindrical concave lens 4, and a variable spherical refractive power S V The lens 6.

[0045] The cylindrical refractive power of the plane-cylindrical concave lens 4 (here being -C 0 ) of the absolute value (or modulus) (here C 0 ) is therefore equal to the cylindrical refractive power of the plane-cylindrical convex lens 2 (C 0 ) absolute value (C 0 ) (or modulus).

[0046] As a variant, the absolute values ​​of the respective cylindrical powers of the plano-cylindrical concave lens 4 and the plano-cylindrical convex lens 2 can be set to be (slightly) different, but in any case they are such that in at least one of th...

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Abstract

The invention relates to a phoropter (100) comprising: - a housing having a front face which includes a first optical window, and a rear face that includes a second optical window which is aligned with the first optical window in relation to a viewing optical axis; and - at least one vision correction device for seeing along the viewing optical axis. Between the first window and the second window, the vision correction device comprises a first optical element having spherical power along the variable optical axis. The housing is mounted on an orientable holder (104) which can rotate about a horizontal axis (H) in relation to a stationary part (102). A method for measuring refraction using a phoropter of said type is also described.

Description

technical field [0001] The present invention relates to the field of vision measurement. [0002] More particularly, the present invention relates to refractometers and methods of measuring refraction using such refractometers. Background technique [0003] In the context of measuring the visual acuity of a patient, it has been proposed to simulate the visual compensation to be provided, for example by means of test spectacle frames or a refractometer such as a refractometer head. [0004] The trial spectacle frame is capable of receiving several trial lenses offering different corrections in sequence until a correction suitable for the patient is found. [0005] This solution is impractical and requires the trial lenses to be stored separately in dedicated boxes. Furthermore this solution involves lens exchange, resulting in undesired and discontinuous transitions in the corrective power. [0006] In a refractometer head, the test lens is placed on a number of disks that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02C13/00
CPCA61B3/0075A61B3/0285A61B3/028A61B3/036G02B3/0081
Inventor S·布迪农V·泰杰多德尔里奥M·诺彻
Owner ESSILOR INT CIE GEN DOPTIQUE
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