Topographer and method for mapping corneal surface

摘要

A topographer for mapping the central portion as well as the peripheral portion of the corneal surface is disclosed. The topographer includes a chart image generating part for producing a chart image to fixate the gaze of an eye under test; a measuring light source for projecting concentric ring-shaped measuring lights to the cornea of the eye; a light detector for detecting the image of the measuring light reflected from the cornea; and a vertex measuring optical system. The vertex measuring optical system comprises a vertex measuring light source for radiating a vertex measuring light; a vertex beam splitter for separating the vertex measuring light into two beams; a vertex measuring light projector for projecting one of the two beams to the corneal vertex of the eye, and capable of moving along the surface of the corneal vertex; a collimator for projecting the other beam to a scanning mirror; and a vertex measuring light detector for detecting a light signal produced by superimposing and interfering the two beams reflected from the scanning mirror and the corneal vertex.