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How Common is Convergence Insufficiency

Results from research studies show that about 1 out of every 20 people (5%) have Convergence Insufficiency. Most studies have been conducted with school age children or adults and show that the prevalence of convergence insufficiency is similar across all populations. Studies have not included preschool children and we are, therefore, not sure how common convergence insufficiency is below the age of 6. Even if the condition is present before school age, it tends not to affect performance because most preschool children either are not reading yet or read for relatively short periods of time.

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