Ocular refracting power measuring system

Details Ocular refracting power measuring system Ocular refracting power measuring system

1991-09-20

1993-05-11

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351214, A61B 310, A61B 314

Patent

active

052105555

ABSTRACT:
The ocular refracting power measuring system according to the present invention comprises a projector system having a measuring light source emitting light beam rotatable around optical axis and for projecting an image of light source of the measuring light source on retina of an eye to be tested, a light receiving system having a light blocking member for blocking a part of light beam reflected from retina of the eye to be tested by a circular edge and for conducting the light beam reflected from retina of the eye to be tested onto a photodetector placed at a position approximately conjugate with a pupil of the eye to be tested through said light blocking member, and a controller for calculating ocular refracting power based on the distribution of light amount on a meridian line on said photodetector corresponding to arbitrary position of the measuring light source and for calculating the astigmatic condition based on the ocular refracting power on a plurality of meridian lines.

REFERENCES:
patent: 4266862 (1981-05-01), Trotscher
patent: 4929076 (1990-05-01), Musuda et al.

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