How is nystagmus defined?

How is nystagmus defined?

• A. Slow blinking
• B. Rhythmic, involuntary, rapid oscillatory eye movements
• C. Color vision change
• D. Eye pain

Answer: (B)

Nystagmus is identified by a repeating, involuntary eye movement pattern. It consists of rhythmic, involuntary, rapid oscillations of the eyes. Typically, the eye drifts slowly in one direction and then makes a quick, corrective re-fixation movement in the opposite direction, continuing in a cycle. This fast phase and slow phase sequence produce the characteristic wobble seen with nystagmus, which can occur in various directions depending on the underlying cause and can be observed during checks of vestibular function or certain neurological conditions. The other options don’t describe a pattern of eye motion: blinking is an eyelid action, color vision change involves the retina and cones, and eye pain is a symptom rather than an eye movement phenomenon.

Nystagmus is identified by a repeating, involuntary eye movement pattern. It consists of rhythmic, involuntary, rapid oscillations of the eyes. Typically, the eye drifts slowly in one direction and then makes a quick, corrective re-fixation movement in the opposite direction, continuing in a cycle. This fast phase and slow phase sequence produce the characteristic wobble seen with nystagmus, which can occur in various directions depending on the underlying cause and can be observed during checks of vestibular function or certain neurological conditions. The other options don’t describe a pattern of eye motion: blinking is an eyelid action, color vision change involves the retina and cones, and eye pain is a symptom rather than an eye movement phenomenon.