A - Human Necessities – 61 – M
Patent
A - Human Necessities
61
M
128/111
A61M 25/00 (2006.01) A61B 3/107 (2006.01) A61F 9/013 (2006.01)
Patent
CA 1191062
Abstract of the Disclosure A quantitative corneascope for use with a surgical micro- scope in performing corrective techniques on the eye includes a pair of hinged image projection housing members movably mounted on each side of a surgical microscope and a light and image source for reflecting partial segments of placido rings (mires) from the cor- neal surface of the eye. The microscope utilizes a beam splitter to provide multiple viewing by an operating doctor, an assistant and at television camera. The camera permits viewing of the mires as reflected from the eye, on a monitor. The monitor is provided with apparatus for generating cursor lines on the viewing surface, which cursor lines represent predetermined radii of curvature corresponding to the range of spherical eye shapes. The cursor lines may be adjusted to discrete values in this range of radii of curvature which in turn changes the spacing between the straight lines of the cursor display. The cursor lines may also be adjusted along the X-Y coordinates of the viewing surface. The use of this instrument involves placing the microscope and surgical corneascope mounted thereon over the patient's eye at a fixed distance. A focus mark is displayed on the viewing surface to accommodate this adjustment. In one type of operation, the mires are reflected from the eye and displayed on the viewing surface. The cursor lines are brought into coincidence with the mires to provide an image of the preoperative condition of the eye. This information relating to the preoperative eye condition is stored for later use.
418722
Reynolds Alvin E.
Smart & Biggar
LandOfFree
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