These Optokinetic Flags are used to produce optokinetic nystagmus (OKN) physiologic jerk in a patient's eyes. This is elicited when the patient attempts to fixate on moving, alternative, contrasting squares that are moved in the field of vision.

The flags are 27" (68 cm) long and 3.5" (8.9 cm) wide. The stripe segments are 1½" (4 cm) long. Each flag comes with a guide.