Method and an apparatus for determining the refraction

Details Method and an apparatus for determining the refraction Method and an apparatus for determining the refraction

1986-08-28

1988-03-15

Arnold, Bruce Y.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351205, A61B 310

Patent

active

047309172

ABSTRACT:
The invention relates to a method for determining the refraction of the human eye. The retinal image of an object is imaged via a lens system into an object space and into an image plane which is conjugated with respect to the retina. The spacing of the conjugated plane is analyzed to determine the refraction of the human eye. This analysis is carried out by means of a measuring object which is moved along a plane which is defined by rays of the beam of rays which pass through image points of the retinal image of a target object, such that the beam of rays is divided into two complementing partial beams containing an unevenly divided amount of light energy. The unevenly divided light energy is used to determine the distance of said conjugated plane.

REFERENCES:
patent: 3791719 (1974-02-01), Kratzer et al.
patent: 4079248 (1978-03-01), Lehureau
Cornsweet et al., Journal of Optical Society of America, Apr., 1970, vol. 60, pp. 549, 550.

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