Methods and apparatuses for measuring visual acuity. In one embodiment, a moving fixation target is displayed. A series of optotype letters appearing offset from the moving fixation target is also displayed, and each optotype letter corresponds to a visual acuity. Each optotype letter appears in one of four possible random quadrant locations adjacent the moving fixation target, and each optotype appears only for a limited time.
Oculokinetic offset acuity testing