Abstract: Device for the removal of tissue from the cornea of an eye using a laser beam generator for the production of a laser beam, an optical device by which, during the removal of the tissue, the laser beam is directed onto the cornea to be treated, with an approximately circular beam cross section and a defined removal profile for the beam energy that is transferred to the corneal tissue to be removed, and a control device for controlling the optical device so that a removal profile is formed that, in the radial section starting out from the central beam axis 2 of the beam cross section, has an approximately spherical or concave course in an internal radial region 3 that changes into a point of inflection 4 and an outer radial region 5 that joins the point of inflection 4, with a convex or monotonic decreasing course.

Abstract: Systems, methods, and apparatus are provided for deriving the relative position of an eye by tracking a boundary of the eye such as the limbus (i.e., the interface between the white sclera and the colored iris). A technique for tracking the position of the eye of patient comprises directing light to an annular region of the eye between the sclera and the iris and receiving reflected light from that region. The intensity of the reflected light is then measured to determine a relative position of the eye. In some embodiments, the measured region is scanned around the boundary. In other embodiments, a light spot is scanned around a substantially annular trajectory radially outward from the pupil. The signals corresponding to the intensity of the reflected light are then processed and measured to determine the eye's position. A flap of tissue covering the boundary may be automatically detected so as to selectively measure the boundary away from the flap.

Abstract: A device for corneal surgery includes an oscillating blade which, during a cutting process, separates a corneal lamella. The movement of the blade is stopped at a certain place so that the separated corneal lamella remains attached by a tissue hinge to the corneal tissue which has remained on the eye.

Abstract: Method and apparatus for determining eye refraction using corrective lenses comprising projecting the corrective lens by means of an optical system into the pupil of the eye or in a predetermined spaced relation in front of said pupil, e.g., via a splitting mirror; this permits sight testing without the use of test spectacles and impairment of field of vision.

Abstract: Method and apparatus for projecting or imaging optotypes so that they can be perceived in space under conditions of unimpeded vision without requiring, e.g., projection screens.