Method for establishing fixation in visual field perimetry

Abstract

The present invention provides a method for establishing fixation during computerized visual field perimetry, requiring the subject to fixate on a stationary target for a brief instance as he/she moves a secondary target towards the stationary target. In a preferred embodiment, the subject interactively moves the secondary target in the shape of crosshairs toward the stationary fixation target displayed on a monitor using the operations of a computer mouse. The stationary fixation target has preferably the shape of a small red circle in order to make it readily identifiable by the subject. The computer mouse pointer when contacted attaches itself to the secondary target. The subject then moves his head so that the fixation target is directly in front of him/her, and, while staring at the fixation target, moves the secondary target towards the stationary fixation target. When the secondary target overlaps the stationary fixation target, it disappears, causing a flashing visual test stimulus to be displayed to the subject for a preset time. The flashing visual test stimulus appears substantially simultaneous with the overlapping of the secondary target and the fixation target.

Dependencies are inferred from the claim text.