Factors influencing lid pressure on the cornea.

Purpose: To investigate the effects of eyelid pressure on corneal topography in different angles of gaze and under different eye movement conditions.

Methods: Ten young subjects with healthy eyes were recruited for the study. Corneal topography of the right eye was measured with a videokeratoscope before and after four 15-minute visual tasks (downward gaze of 25 degrees or 45 degrees , both with no eye movements or 1 Hz eye movements).