convergence insufficiency

Convergence insufficiency is a binocular vision disorder characterized by the inability to achieve or sustain proper eye alignment and convergence when focusing on near objects. It occurs due to a deficiency in the neural control or musculature responsible for converging the eyes. Symptoms may include double vision, eye strain, headaches, blurred vision, and difficulty with prolonged near work such as reading. The condition is typically diagnosed through clinical tests evaluating near point of convergence, positive fusional vergence, and the degree of exophoria at near compared to distance.