Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1986-06-23
1989-01-24
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351246, 351219, A61B 300, A61B 310
Patent
active
047997842
ABSTRACT:
An instrument and technique is disclosed for locating the exit point of the visual axis at the corneal surface. Several methods are described. One includes an optical device movable on the corneal surface and being partially reflective and transparent to incident light. A collimated light beam is directed along the axis through the device onto the retina of a patient's eye, and a viewing means is provided for observing a light beam reflected from the device along the incident axis when the eye fixates on the collimated beam. The invention can also be implemented for direct visualization without the optical device, by off-axis viewing of scattered light produced by the incident collimated beam impinging on the corneal tissue, or by viewing fluorescent radiation from the point of intersection of the incident beam produced by a fluorescent dye applied to the cornea.
REFERENCES:
patent: 4265519 (1981-05-01), Pomerantzeff
patent: 4669837 (1987-06-01), Schirmer et al.
"Measurement of Visual Axis Using a Laser Beam", Advances in Diagnostic Visual Optics, Hiroshi Vozato et al, pp. 22-28.
"The Operating Microscope, III. Accessories", Peter Hoerenz, Dipl. Ing. Phys., Journal of Microsurgery, pp. 22-26, Sep. 1980.
"The New Weck Surgical Microscopes", Edward Weck & Co., Inc., Weck Drive, P.O. Box 12600, Research Triangle Park, NC 27709.
"Comparison . . . ", by Steinberg et al, American Journal of Ophthamology, pp. 605-608, Nov. 1983.
Bovernick Rodney B.
Ryan Jay
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