How do you use the OKN drum?
Instruct the subject to look at the spinning drum and observe the subject’s eye movements. This movement is involuntary and, as long as the subject is looking at the drum, uncontrollable. Move the subject farther and farther away from the drum and make note if the distance at which the OKN is no longer apparent.
Is visual acuity an objective?
Objective visual acuity was defined as the smallest size stripe that evoked the OKN response (induction method) or as the smallest dot size that suppressed the OKN response (suppression method). Distance visual acuity was measured by computerized OKN and infrared oculography at distance.
Is visual acuity subjective?
Subjective vision ratings are a better indicator of simultaneous-image contact lens performance than visual acuity. Subjective vision ratings should be used to evaluate performance rather than visual acuity alone.
Is visual acuity subjective or objective?
The examination of visual acuity has objective and subjective methods. Subjective examinations: assessment of distant vision, assessment of near vision.
What do optokinetic exercises do?
Purpose: Treating vestibular dysfunction with optokinetic stimulation (OKS) has been suggested as both efficient and effective. It is based on the theory that a sensory conflict situation can force central compensation of a diseased vestibular system to yield successful balance.
What is optokinetic tracking in real life?
In real life, the optokinetic system kicks in when the vestibular system fails to ‘‘keep up’’ during sustained head rotation. Optokinetic tracking is similar to smooth pursuit tracking in its mechanism of origin, and abnormalities in this test suggest the possibility of a cerebellar disorder.
What is optokinetic nystagmus?
As the vestibular response gradually decays, the optokinetic and pursuit systems provide input to stabilize the eyes and maintain stable vision. Optokinetic nystagmus can be simulated by exposing the patient to repetitive moving visual stimuli.
How does Optokinetic Stimulation work in Eng?
Current ENG systems provide optokinetic stimuli by having lights move along a light bar, asking the patient to ‘‘count each light’’ as it passes by, or a laser projector that projects long stripes on the wall, moving side to side.
Is Optokinetic Stimulation effective for treating vestibular dysfunction?
Balance and Vestibular Center, San Joaquin Valley Rehabilitation Hospital, Fresno, CA. Purpose: Treating vestibular dysfunction with optokinetic stimulation (OKS) has been suggested as both efficient and effective.