Abstract: An apparatus (10, 10?) for detecting the surface topography of a cornea (24) of an eye (22) by dynamic or static projection of a pattern onto the surface of the cornea and detection of the pattern reflected by the cornea, providing preferably simultaneous detection of at least one optical property of a layer disposed beneath the cornea.

Abstract: An apparatus (10, 10′) for detecting the surface topography of a cornea (24) of an eye (22) by dynamic or static projection of a pattern onto the surface of the cornea and detection of the pattern reflected by the cornea, providing preferably simultaneous detection of at least one optical property of a layer disposed beneath the cornea.

Abstract: An apparatus (10′) for detecting the surface topography of a cornea (24) of an eye (22) by dynamic or static projection of a pattern onto the surface of the cornea and detection of the pattern reflected by the cornea, providing preferably simultaneous detection of at least one optical property of a layer disposed beneath the cornea.

Abstract: The invention is directed to a method and apparatus for the contact-free measurement of the actual position and/or of the profile of coarse surfaces. Laser light generated by a laser has at least two different wavelengths and is directed to the surface to be measured. A beam splitter is placed between the surface to be measured and the laser to split the laser light into a reference beam and a measuring beam. The reference beam is reflected on a reference plane surface. A speckle pattern is formed in the interferogram plane of the reflected light. From the speckle pattern, a bright laser speckle is selected for all wavelengths by means of a measuring diaphragm having a diameter less than that of a laser speckle. Behind the measuring diaphragm, the two wavelenths are separated from each other and the phase difference between the signals of the different wavelengths is measured.