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Convergence amplitude insufficiency.

There is a frequently overlooked group of patients, usually under 20 years of age, with typical symptoms of convergence insufficiency and diminished convergence amplitudes, but with normal near point of convergence. We studied ten cases of this type, which we call convergence amplitude insufficiency. The diagnosis in such patients will not be missed if convergence amplitudes are measured on every patient complaining of asthenopic symptoms during close work.