Convergence insufficiency is a syndrome of binocular vision. This occurs when
one or both eyes tend to drift slightly outward at the reading distance, and extra effort is
required to hold the eyes in alignment. This is a problem of the coordination and teaming
of the eye muscles and may contribute to symptoms of headaches and eye fatigue.
Convergence insufficiency could also lead to a slight reduction in depth perception.
Convergence insufficiency can be diagnosed through a typical eye exam. Some
people do not even know they have the disability because it could be a disability a child
is born with, but it might not show up in the child until age three. Most children start
experiencing difficulties of headaches and tired eyes, and they tell the eye doctor when
they go in for an eye exam. The diagnosis of convergence insufficiency is based on the
finding of a remote near point of convergence and decreased fusional convergence at near
fixation. In other words, a child will have problems seeing up close. According to the
American Optometric Association one or more of the following diagnostic findings
characterizes convergence insufficiency: High exophoria at near, tight accommodativeconvergence/
accommodation, and low fusional convergence ranges.
Convergence insufficiency can occur at any age but seldom becomes a clinical
problem until a patient reaches his or her teens. Characteristics of this disability consist
of eyestrain and a sensation of tension within the eyes. For a child, after brief periods of
reading, the letters in the text will blur and run together. This part of the disability on
convergence insufficiency is called crossed diplopia, which occurs during near work.
According to the article "Vision, Learning, and Dyslexia" written by Ronald Bateman,
some of the most common characteristics of convergence insufficiency is double vision,