Method and device for central and suppression scotomas investigation

摘要

New way for investigation of visual field, based on virtual reality methods, is presented. It can use for central and paracentral scotomas registration. The study is realized by presentation of the luminous stimuli at monitor screen and its observation with two open eyes. The liquid-crystal shutters are fixed before eyes. Special driver alternately opens that right, that left eyes with frequency exceeding frequency of flicker fusion. This enables to control visibility of vision field separate areas. Program provides stimulus presentation in accident manner in different areas of visual field, so that some of presentation coincides by phase with right eye opening, but some with left. Patient press space bar if he observe stimulus. As the result computer print two vision field maps in which stimulus is invisible by right, or by left eyes, that is to say draws scotomas. Thereby this enables to fix central scotoma borders, as well as suppression scotoma in strabismus too. In program are provided possibility to change brightness and color of stimuli, background and fixation point, time and frequency of appearance of stimulus, its dimension and shape. Modification of device is considered in stationary (on the base of personal computer) and portable variant.