Haag-streit Ag

Other

Franz Papritz

Hansruedi Widmer

Yves Robert

Phillip Hendrickson

An ophthalmologic apparatus for repeated optical or photometric examination of the fundus or another portion of a patient's eye has an illuminating unit with a light source for a microscope. The optical axis of the microscope can be repeatedly moved to one and the same position relative to a beam of radiation issuing from the center of curvature of the external surface of the cornea in a patient's eye with assistance from a positive field lens which is adjustable with the microscope and acts not unlike an ophthalmoscopic lens for indirect ophthalmoscopy. The lens projects for the microscope a real intermediate image of the selected portion of a patient's eye in an intermediate plane adjacent that focal point of the lens which is remote from the patient's eye. An illuminated or radiation emitting marker is provided at that side of the intermediate plane which faces away from the lens and close to the optical axis of the microscope. The aforementioned components of the apparatus are jointly adjustable by the person in charge along one, two or all three axes which intersect and are inclined relative to each other. Such adjustment is carried out until the intermediate plane receives a sharp image of the selected portion of a patient's eye. A selected portion of the intermediate plane (namely a portion which is observable through the microscope) provides for the microscope a sharp image of the illuminated marker with assistance from a patient's eye in that the external surface of the cornea performs the function of a spherical mirror.

Ophthalmologic apparatus

Photographic attachment and shutter device for a binocular microscope

A spring is continuously acting on an upper part adjustable in the height by a spindle for compensating the weight of the vertical adjustable parts. An additional compensating spring acts over a piston on the upper part. By means of a screw which can be screwed in a threaded hole, the piston can be coupled with the base which is not displaceable in the height so that the effect of the additional spring is cut off. Many compensating springs can be provided which, at choice, can be rendered effective or ineffective in order to compensate for different weights.

Height adjustable supporting device for an instrument

Behind of the front objective, in the region of both parallel axes of the beams of rays of the microscope is disposed a slewable optical prismatic body with two plane parallel front faces and two opposite inclined, parallel refractive pairs of faces. In a basis position of this prismatic body, the path of the axes of the beams of rays remains uninfluenced by the plane parallel front faces of the optical prismatic body. In a position of the optical body pivoted by 90.degree., the beams of rays pass through the inclined refractive faces and they experience a transverse displacement. In accordance with the position of the prismatic body one may obtain therefore a greater or smaller stereoscopic angle .alpha.. This leads to significantly improved viewing possibilities, more particularly for eye examination.

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Niederscherli, Switzerland

Franz Papritz