Convergence insufficiency (CI) is a vision disorder. It is a disorder involving binocular vision — vision using both eyes.
Convergence describes the way our eyes move together and point inward when we look at near objects. With CI, the eyes do not point together inward as one looks at objects close-up.
CI affects children and adults. It often goes undiagnosed. Doctors who do diagnose it often identify CI when children are learning to read.