Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1989-12-22
1991-10-08
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351247, A61B 310
Patent
active
050549073
ABSTRACT:
An ophthalmic diagnostic instrument determines the shape of the cornea through projection of an image onto the cornea through the optics of the diagnostic instrument. The instrument and the method of the invention involve folding a projected pattern of discrete separated point light sources so that the pattern is projected toward the eye coaxially with return collected light reflected off the cornea. The instrument avoids any need for a pattern light source directly adjacent to the eye, and provides the surgeon or other eye care specialist with a real time image accurately displaying the shape of the cornea. The surgeon is thus able to monitor the corneal shape prior to surgery, to monitor its changes during the course of the surgery, and to further monitor the cornea in post operative stages. In a specific embodiment of the invention, a real image of the pattern of point light sources is formed inside or very closely in front of the objective lens of the system so that the objective lens becomes a field lens and the angle of view of the system is enlarged.
REFERENCES:
patent: 4312574 (1982-01-01), Wilms
patent: 4878750 (1989-11-01), Sekiguchi
S. G. El Hage, "Suggested New Methods for Photokeratoscopy, A Comparison of their Validities, Part I", American Journal of Optometry and Archives of American Academy of Optometry, pp. 897-912, 11/71.
Ferrer Olga M.
Frank Alan M.
McMillan Charles
Sklar H. Alfred
Bovernick Rodney B.
Freiburger Thomas M.
Phoenix Laser Systems, Inc.
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