Abstract: A test pupil device for Corneal Topography, having a videocamera in sequence with an optical group including lenses, an outside Placido disk, a fixing LED, an infrared fixing LED, a neon glow lamp and including at least one beam splitter plate. An infrared LED may be placed laterally onto the Placido disk or away from the Placido disk and is provided so to provide for a grazing light for the pupil test. The lateral LED and the fixing LED are infrared LED's so as not to interfere with the light sources to be used for the cornea test that uses frequencies in the visible light range.

Abstract: A stereoscopic microscope which makes use of two pairs of lenses, each pair having a different magnification. Both pairs of lenses are supported in a disk-shaped drum along a pair of orthogonally related diameters and rotatable through an angle of 90.degree. by a draw lever to place the two pairs of lenses alternatively in position for use by an operator for a direct observation of the image of the patient's eye structure and for all operating functions of a video recording camera. The optical scheme makes use in one direction of a right-angle prism arrangement for deviating rays from a patient's eye in an opposite direction, towards the video recording camera.