Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1989-02-09
1991-02-12
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351205, 351214, 351221, A61B 314, A61B 310
Patent
active
049919539
ABSTRACT:
An instrument for imaging the vitreous of an eye wherein first and second windows in the iris plane accommodate a slit illumination or observation beam, and the two beams are synchronously scanned. Both beams pass through a common objective optical system, including an aspheric ophthalmic lens, and the observation beam is descanned by a mirror and spatially filtered by an observation slit conjugate to the slit which forms the illumination beam. Lateral position or width adjustment of a slit varies the axial extent or position of the focal region, to produce an image free of retinal reflection. Slit width may be increased to simulataneously image with good resolution and contrast all planes within a broad range of depths. In one binocular embodiment, the observation and illumination paths are alternately interchanged to produce a pair of stereo images formed along identical, but reversed, optical paths with a single set of optics. In a different embodiment, a common scanning element illuminates the vitreous, which is viewed along symmetrical left and right observation imaging paths. Different means of synchronous scanning and of forming a binocular image are shown. A descanned time varying line image may be converted to an electrical image signal, or may be optically rescanned to expose a photographic plate or form a directly viewable image.
REFERENCES:
patent: 4170398 (1979-10-01), Koester
patent: 4838679 (1989-06-01), Bille
Koester, C. J. Scanning Mirror Microscope with Optical Sectioning Characteristics: Applications in Ophthamology, Applied Optics vol. 19, No. 11, pp. 1749-1757, 6/80.
Rioux, Marc et al. Design of a Largedepth of View Three-Dimensional Camera for Robot Vision, Optical Engineering, vol. 26, No. 12, pp. 1245-1250.
Bickel, G. et al., Triangulation with Expanded Range of Depth, Optical Engineering, vol. 24, No. 6, pp. 975-977, 12/85.
Pflibsen Kent P.
Reznichenko Yakov
Bovernick Rodney B.
Eye Research Institute of Retina Foundation
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