Vision diagnostic and therapeutic instruments by Keystone View. This versatile cheiroscopic type instrument is designed for in-office diagnostic and therapeutic applications. Excellent for diplopia, fusion and accommodation training, it's also a valuable aid for treatment of suppression and hyperphoria. The supporting ledge strip for cards and sheets has a calibrated scale for making direct prism computations at various accommodation levels.
Ground magnifying lenses provide full binocular vision.
The optical centers of the lenses are separated 85 mm to provide for adequate base-out simulation. The shaft is calibrated for precise head adjustment. Cards and sheets rest on a support leoge having a calibrated scale to simplify the use of split-card targets and to provide for direct measurement of ductions. The ledge transfers easily between high and low positions to accommodate all sizes of material. A spring steel ctip helps hoLd paper targets in place.