Small pupil binocular indirect ophthalmoscope

摘要

A binocular indirect ophthalmoscope of the type having a central reflecting prism and a pair of adjustable oculars. The instrument may be used in the examination of eyes having either normally dilated or small pupils. Small pupil capability is achieved by making the aperture of each ocular substantially larger than in conventional ophthalmoscopes. By moving the oculars outwardly from the center line of the observer's pupils, the observer views along an axis offset from the optical axis and utilizes the apex portion of the reflecting prism. In this manner, the observer's pupils may be imaged into a patient's pupil as small as 1.5 millimeters in diameter. The plurality of adjustments required in prior art small pupil ophthalmoscopes is thereby avoided.PPThe foregoing abstract is not to be taken either as a complete exposition or as a limitation of the present invention. In order to understand the full nature and extent of the technical disclosure of this application, reference must be had to the following detailed description and the accompanying drawings as well as to the claims.