Phoropter

Abstract

The phoropter is provided with a rotating knob means for selecting specific types of functions (12,13,14), the angular position being picked up by means of a pulse generator, e.g. a light barrier (8,9) in the form of an electric signal (amplifier 10) and, via a processing stage (11), more particularly a counter, is supplied to at least one function setting stage (12,13,14), while the requisite engagement of defined angular positions is effected with the aid of magnets (7), an angle indicating means for the cylindrical lens systems, whose angularity of the shaft position is indicated by light-emitting elements in order to facilitate the readability for the examining party, said light-emitting elements being arranged on the side of the examining party in a circular disposition around the viewing aperture and being operated in the bright state from a keyboard console in accordance with the shaft position, and a main support on a frame fitted with a forehead rest mounted on a phoropter housing protected against the environment by a covering, while, on the main support, two lateral supports are mounted so as to be approximately horizontally displaceable relative to each other, on which one shaft support each is attached with an approximately horizontal shaft about which the disks of a stack are rotatable, the parts mounted on the main support and on the left-hand and right-hand lateral supports each being protected by a partial covering and in which the partial covering of the main support is interconnected with the partial coverings of the lateral supports via a bellows each (FIG. 1 ).