Prevalence

A British survey found that less than 1 in 300 patients receiving optometric eye examinations had convergence insufficiency and a Spanish study found that nearly 1 in 100 (0.8%) of symptomatic patients in an optometric clinic had CI. In contrast, studies conducted by the Southern California College of Optometry found that approximately 1 in 8 (13%) of fifth and six grade children examined during visual screenings had the disorder as did nearly 1 in 5 (17.6%) of 8 to 12 year olds receiving examinations at optometry clinics. A recent Romanian study revealed that roughly 3 in 5 (60.4%) of young adult patients complaining of blurred vision at near work suffered from convergence insufficiency.