binocular eye test device with polarized testzeichen

摘要

The sight testing device uses polarised test chacaters and an analyser inserted in the light path between the test characters and both eyes of the patient. The polarisation direction in each light path is varied via an electrially controlled device, such as a liquid crystal device. The polarisation direction for each light direction is controlled indenpendently, the polarised test characters projeted into a projection surface, with the electrically controlled polarisation direction device positioned directly in front of the projector. ADVANTAGE - Rapid switching between different test modes.