Automatic vision testing system for children

摘要

A visual acuity testing system includes a computer 1 with a high-resolution display 2 linked to a video camera 3. Vertical gratings of varying width are presented either side of a central target image or video, coincident with an iso-luminant image opposite the grating. A digital video camera adjacent to the display is employed to track eye position using software algorithms that relate eye movement to the position of the vertical grating. Software analysis adjusts for head movement, blinks and corneal reflexes. The system eliminates the need to lift acuity cards manually, and provides an automated and objective method of vision assessment in pre-verbal children and those unable to communicate in standard visual acuity tests.