Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1988-06-27
1990-10-02
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351205, 351211, A61B 310
Patent
active
049603272
ABSTRACT:
The present invention relates to the optical system in a laser scanning eye fundus camera. The optical system comprises: an illuminating optical system for scanning an eye fundus with an illuminating laser light beam from a light source using a light scanning device; a light receiving optical system for directing the reflected light from the eye fundus to a light receiver unit; and a beam diameter adjusting means associated with said optical systems for adjusting the beam diameter of the laser beam or of the light for observation. Such arrangement according to the present invention allows to adjust the depth of field by adjusting the aperture diameter of the optical system by means of the beam diameter adjusting means so that test or inspection of even or uniform quality can be ensured for all subject in spite of variations in their age, experience of medical or opthalmological tests or inspections, or structure of the eye fundus.
REFERENCES:
patent: 4764005 (1988-08-01), Webb et al.
Bovernick Rodney B.
Kabushiki Kaisha Topcon
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