Which is the most common non-strabismic binocular vision disorder?

• A. Convergence Insufficiency
• B. Convergence Excess
• C. Divergence Insufficiency
• D. Divergence Excess

Answer: (A)

Convergence insufficiency is a vergence problem where the eyes don’t converge adequately for near tasks, so sustaining single, comfortable vision up close is difficult. This makes it the most commonly encountered non-strabismic binocular vision issue in practice. Clinically, it often shows up as exophoria at near, reduced positive fusional vergence, and a receded near point of convergence, with symptoms like eyestrain or headaches during reading or other near work. The other vergence anomalies—convergence excess, divergence insufficiency, and divergence excess—are much less common and each has distinct patterns or associations that make them far less likely to be the most frequent issue.