Patent ID: 7976163

Claim:
A system for measuring a corneal topography of an eye, comprising: a group of first light sources arranged around a central axis, the group being separated from the axis by a radial distance defining an aperture in the group; a plurality of second light sources; a detector array; an optical system adapted to provide light from the second light sources through the aperture to a cornea of an eye, and to provide images of the first light sources and images of the second light sources from the cornea, through the aperture, to the detector array; a third light source providing a probe beam; and a Shack-Hartmann wavefront sensor; wherein the optical system is further adapted to provide the probe beam through the aperture to a retina of the eye, and to provide light from the probe beam scattered by the retina through the aperture to the wavefront sensor; wherein the optical system includes an optical element having a focal length, f, and an adjustable telescope in an optical path between the eye and the wavefront sensor; wherein the second light sources are disposed to be in an optical path approximately one focal length, f away from the optical element; and wherein at least one of: (1) the optical system further comprises a dynamic range limiting aperture in an optical path between the first and second lenses; and (2) the adjustable telescope provides a common optical path for both the probe beam from the third light source to the eye, and the light scattered by the retina to the wavefront sensor.