Convergence insufficiency is a relatively common problem encountered in clinical practice, especially for those specializing in pediatric ophthalmology and strabismus. It affects older children, teenagers, and adults, and typical symptoms are difficulty with reading, eye strain or discomfort with near work (asthenopia), and headaches. The diagnosis is established when patients demonstrate reduced near fusional convergence amplitudes and/or a remote near point of convergence. Older adults in particular may have concurrent accommodative insufficiency. Not all patients with convergence insufficiency are symptomatic, and for those patients, treatment is generally unnecessary. Conversely, many patients with asthenopic symptoms have normal convergence.
Wallace DK. Treatment Options for Symptomatic Convergence Insufficiency. Arch Ophthalmol. 2008;126(10):1455-1456. doi:10.1001/archopht.126.10.1455