The present invention provides a method for establishing fixation during
computerized visual field perimetry, requiring the subject to verbally
identify the symbol employed as fixation targets as they each appear.
Speech recognition techniques are then employed to evaluate the subject's
response, and, upon correctly identifying the fixation symbol, a visual
test stimulus is displayed at a predetermined location within the
subject's field of vision. Fixation is established by displaying to the
subject fixation targets represented by varying symbols, which may be
displayed at one or more locations on a display monitor. These so-called
fixation symbols, include geometrical shapes, letters, numbers, pictures
or other symbols readily identifiable by the subject. When a fixation
symbol appears, the subject verbally identifies the symbol by saying the
name of the symbol into a microphone. Using speech recognition, the
system recognizes the response from the subject, and evaluates whether
the symbol was correctly identified by the subject. Upon being correctly
identified, the fixation symbol disappears, and a flashing visual test
stimulus is displayed within the subject's field of view for a preset
time.