TOPOGRAPHICAL CORNEA MAPPING FOR CORNEAL VISION CORRECTION

摘要

A method and device for highly accurate corneal topographical mapping (40) and a device for effecting vision correction by removal of corneal tissue (10). The method and device involve use of a modified optical interferometer (30) with directing of a coherent light beam (31), such as from a laser, to the anterior surface of a cornea (10); splitting the beam (34) so that half the beam is directed to a reference object (35) having a predetermined shape; capturing (41, 42) the reflected light from the cornea and the reference object so as to form an interference pattern (40), and using the interference pattern to determine deviations or displacements of the corneal surface from the known reference shape.