Practice Quiz

Ophthalmic Assistant

Category - Visual Assessment

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The optokinetic nystagmus (OKN) drum or strip is used to
  1. establish the existence of vision.
  2. test contrast sensitivity.
  3. determine visual acuity.
  4. determine the source of refractive errors.
Explanation
Answer: A - establish the existence of vision.

The optokinetic nystagmus (OKN) drum or strip is used to establish the existence of vision. The size of the stripes or figures on the drum will indicate the level of vision. The examiner turnsthe drum slowly in front of the patient’s eyes; the seeing-eye automatically follows the stripes onthe drum. While the patient is watching the turning drum, the assistant alternately covers thepatient’s eyes. If one eye truly cannot see, then it will stop moving.
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