Subjective eyesight and visual display unit visibility test

摘要

A computer-based procedure uses a combination of software and ancillary equipment to test various aspects of the computer user's eyesight and screen quality. Test patterns are presented on the screen 2 while the ancillary equipment (e.g. linear polarising filters 5, 6 mounted on the screen 2 and 3, 4 in front of the user's eyes) allows control over which pans of the test patterns are seen by each eye. By determining the smallest size of test pattern that can reliably be identified, monocular or binocular visual acuity can be estimated. By detecting misalignment of detail seen by each eye, ocular co-ordination can be estimated. The visibility of detail on the screen can be assessed by presenting targets at various screen locations. Areas where the user cannot accurately identify detail indicate localised impairment of visibility, due to such factors as on-screen glare from light sources, or poor or uneven screen quality. IMAGE