Optokinetic Nystagmus Drum

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Mini Optokinetic OPK Drum

Richmond Products, Inc.

Description
: Accurately tests for nystagmus when rotated at 8-10 rpm. The optokinetic reflex allows the patient to follow objects in motion when the head remains stationary (eg, observing individual telephone poles on the side of the road as one travels by them in a car). The reflex develops at about age 6 months. The normal eye movements that one observes depend upon the orientation of the drum in front of the patient. If the drum is held in front of the patient with the bars directed vertically and is spun to the left (the patient's right), one would observe a slow pursuit movement of the eyes to the patient's right as a moving bar is followed, then a quick saccade to the patient's left as the patient searches for the next moving bar to fixate on and again follows that bar with a slow pursuit movement to the patient's right.
- This reflex is abnormal in patients with congenital nystagmus. One may observe a paradoxical reversal of the optokinetic nystagmus response.
- Patients with horizontal nystagmus with unilateral hemispheric lesions, especially parietal or parietal-occipital lesions, show impaired optokinetic nystagmus when the drum is rotated toward the side of the lesion.
- The OKN drum may be used as an estimate of visual acuity. The striped drum is equivalent to a vision of counting fingers when held at a distance of 3-5 feet from the patient. The further the drum is from the patient, the better the visual acuity must be to respond normally to the moving drum.
Confrontational visual field testing may reveal gross field defects that may help determine the presence and/or location of an intracranial lesion. For Romberg testing have the patient stand with eyes closed and feet together. If a defect in the vestibular system is present, the patient tends to fall toward the side of the lesion.
OKN Drums are used primarily by Neuro-Ophthaolmologists, Optometrists for Nystagmus evaluation and in Emergency Rooms for hysterical blindness evaluation.
Richmond’s new Mini OKN Drum is 20% smaller and measures 8" high by 6" diameter ( 20 cm x 15 cm) and weighs 25 oz (680 grams). The lighter weight and smaller size makes the drum much easier to use with the patient and takes up less storage space.
The Mini drum spins on ball bearings for effortless rotation. For use 24" to 30" from patient. Standard Black and White stripes are useful for adults and children.

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Standard Optokinetic Drum

Richmond Products, Inc.

Description: Accurately tests for Nystagmus when rotated at 8-10 rpm. Drums are 10" high by 8" diameter. Light weight drum of professional quality with ball bearings for effortless spin mechanism. For use 24 to 30 inches from patient.

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