Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1990-07-06
1991-11-19
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351205, 351211, A61B 310
Patent
active
050661167
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 receiving unit; a beam diameter adjusting system associated with the optical systems for adjusting the beam diameter of the laser beam or of the light for observation; and a system for interlocking the adjustment of the beam diameter adjusting system with the adjustment of the magnification adjusting system wherein an adjustments of the magnification adjusting system to increase the magnification causes the beam diameter adjusting system to be adjusted to reduce the beam diameter. Such arrangement according to the present invention allows the adjustment of the depth of field by adjusting the aperture diameter of the optical system by the beam diameter adjusting system so that a test or inspecption of uniform or even quality can be ensured for all subjects in spite of variations in their age, experience of medical or opthamological tests or inspections, or structure of the eye fundus.
REFERENCES:
patent: 4764005 (1988-08-01), Webb et al.
Bovernick Rodney B.
Kabushiki Kaisha Topcon
LandOfFree
Optical system in a laser scanning eye fundus camera does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical system in a laser scanning eye fundus camera, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical system in a laser scanning eye fundus camera will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1366391