Apparatus for measuring the refractive power of an optical syste

Details Apparatus for measuring the refractive power of an optical syste Apparatus for measuring the refractive power of an optical syste

1982-03-29

1985-07-02

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

356126, A61B 310

Patent

active

045264511

ABSTRACT:
An apparatus in which an optical system to be examined is periodically scanned by a slit-like illuminating light beam and the light beam from the optical system is received by two pairs of photoelectric converters and the refractive power of the optical system is measured on the basis of the phase difference between the output signals of the photoelectric converters forming each of said pairs includes projection means capable of alternatively scanning the illuminating light beam from two known directions, output means adapted to put out a discrimination signal of the scanning direction of the illuminating light beam, and operational means for receiving the discrimination signal and the phase difference as inputs and obtaining a refractive power.

REFERENCES:
patent: 3136839 (1964-06-01), Safir
patent: 3715166 (1973-02-01), Leighty et al.

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