Cupola-type ophthalmological apparatus the visual field and the

Abstract

This invention relates to a cupola-type visual stimulation ophthalmological pparatus for examining the visual field of a patient and performing electrophysiological examinations. It comprises a projection screen consisting of the inner surface of a hemispherical cupola, the patient's eye being disposed centrally of the cupola during the examination. A device for projecting visual stimuli on the screen is provided in the upper portion of the cupola and comprises essentially a casing incorporating a light source, filter means, an object mask, a lens and a movable reflecting mirror located in the vicinity of the cupola center. This mirror is adapted to project toward any desired point of the screen a luminous stimulus perceived by the patient for measuring the extent of the patient's visual field. Moreover, with the projection device it is possible to illuminate the complete visual field according to criteria relating specifically to electrophysiological examinations. For this purpose, the casing comprises a window adapted to be masked for examining the visual field and to be opened for making electrophysiological examinations, the light rays from the light source being deflected through the window for illuminating the complete screen surface. The various optical control members necessary for performing visual tests can also be used for electrophysiological examinations since the projection device is polyvalent and thus capable of accomplishing both types of examinations.