Multifixation Campimetry on the Internet

Abstract

Abstract: : Purpose: To develop e–perimetry for enabling lay individuals to detect visual field loss using the internet Methods: We have developed: (1) multifixation campimetry, which allows the central 25° of visual field to be examined using a standard computer monitor, viewed from the normal working distance; (2) oculo–kinetic perimetry, which utilises instead of suppressing the instinctive reflex to look at the stimulus; (3) interactive numeric fixation targets, which enhance gaze–control, also enabling point–for–point monitoring of fixation; (4) directional signalling of stimulus awareness, which prevents the patient from guessing; and (5) dark–on–bright stimuli, which enhance sensitivity and reduce variability. The test is fully supported by written instructions with illustrations, animated demonstrations, and interactive rehearsals. Results can be viewed on screen, saved on disc and e–mailed for assessment. The test mimics a computer game, with sound effects, enhancing user–friendiness Results: Since its launch in October 2002, our website (http://www.testvision.org) has attracted thousands of visitors, many sending results and comments. Several health websites have established links to our test. Feedback has mostly been positive and enthusiastic. E–mailed visual field results include numerous examples of success, some of which will be exhibited in our poster to illustrate the potential of our test. Conclusions: Results indicate that our multifixation campimetry on line has made e–perimetry possible, creating new opportunities for detection of visual field loss and tele–perimetry for disease monitoring.

Keywords: perimetry • detection • visual fields