What is characterized by the presence of involuntary eye movement?

• A. Conjunctival infection
• B. Nystagmus
• C. Diplopia
• D. Cerumen impaction

Answer: (B)

Nystagmus is a condition characterized by involuntary eye movements, which can occur in different directions, including side-to-side, up and down, or circular. These movements are often rhythmic and can affect balance and vision. Nystagmus can occur due to various factors, including neurological conditions, inner ear problems, or as a side effect of certain medications. The presence of these involuntary movements distinguishes nystagmus from other conditions, making it the correct choice in this context.

Conjunctival infection typically involves redness or irritation of the eye's surface but does not cause involuntary eye movements. Diplopia refers to double vision, which may arise due to misalignment of the eyes but is not characterized by involuntary movements. Cerumen impaction pertains to earwax buildup in the ear canal, which could lead to hearing issues but has no relevance to eye movement.