Gerät zur topografischen Bestimmung anatomischer Oberflächen, insbesondere der Kornea

摘要

An apparatus for topographical analysis of the shape of a partially reflecting anatomical surface, specifically the cornea, comprises a body (11) made of a transparent material (e.g. PERSPEX) wherein a conical hole has been drilled. Circular, frusto-conical, alternatively transparent and opaque, retro-illuminated, reference lines are provided in the conical surface of the hole. The apparatus comprises a photoelectrical couple (17, 18) (e.g. an emitter: IRED or LED; and a sensor: photodiode or phototransistor) arranged at diametrically opposed points of the external edge (34) of the cone, such that when the cone is moved close to the eye to be analysed, the apex of the eye intercepts the sight line between the emitter and the sensor at a pre-established distance from the cone. The light patterns reflected from the reference sight lines upon the cornea are detected by a TV camera (13) arranged near the apex of the cone and after being suitably processed by a computer (14), enable the shape of the cornea as well as the curvature of all points thereof, within a relatively large area, to be analysed.