Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1987-05-12
1988-11-01
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351206, 351221, A61B 310
Patent
active
047814535
ABSTRACT:
An ophthalmic examination apparatus directs a laser beam from a laser light source onto the fundus of an eye to scan the fundus two-dimensionally, picks up the light reflected back from the eye fundus and by means of a photoelectric transducer subjects the light to photoelectric conversion to obtain information about the eye fundus. A laser light source is provided that generates laser beams of a plurality of wavelengths, a first acousto-optical device selects one wavelength from among the plurality of laser beam wavelengths, a first optical deflector is used to scan a laser beam in one direction at a predetermined frequency, and a second optical deflector is used for scanning the laser beam in a direction at right-angles to the above direction at a frequency that is lower than the above frequency. The first optical deflector is constructed as the second acousto-optical device which is driven at an ultrasonic frequency, and by changing the range of variability of the ultrasonic frequency of the second acousto-optical device in accordance with the laser beam wavelength selected by the first acousto-optical device, the angle of deflection of the first optical deflector becomes the same irrespective of the wavelength of the laser beam.
REFERENCES:
patent: 4541697 (1983-05-01), Remisan
Adams Bruce L.
Bovernick Rodney B.
Kowa Company Ltd.
Wilks Van C.
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