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Convergence insufficiency is a binocular vision disorder that affects the ability of the eyes to turn towards each other. It can cause symptoms such as double vision, eye strain, headache, and difficulty reading. Learn about the diagnosis, treatment, and prevalence of convergence insufficiency.
A Brock string is an instrument used in vision therapy to develop skills of convergence and disrupt suppression of one eye. It consists of a white string with three beads of different colors, spaced out at various distances.
Accommodative insufficiency is the inability of the eye to focus properly on near objects. It can be caused by systemic or local factors, and may be treated with lenses, exercises or surgery.
Spasm of accommodation is a condition in which the eye cannot relax when viewing distant objects, causing blurred vision. Learn about its causes, symptoms, treatments, and research on this page.
Suppression of an eye is a subconscious adaptation by a person's brain to eliminate the symptoms of disorders of binocular vision such as strabismus, convergence insufficiency and aniseikonia. The brain can eliminate double vision by ignoring all or part of the image of one of the eyes.
Accommodative excess may occur secondary to convergence insufficiency also. In convergence insufficiency near point of convergence will recede, and positive fusional vergence (PFV) will reduce. So, the patient uses excessive accommodation to stimulate accommodative convergence to overcome reduced PFV.
Positive relative accommodation (PRA) in biology, is a measure of the maximum ability to stimulate eye accommodation while maintaining clear, single binocular vision. [1] ...
Argyll Robertson pupil is a sign of neurosyphilis or diabetic neuropathy, characterized by small pupils that accommodate but do not react to light. Learn about the pathophysiology, diagnosis, treatment and history of this rare condition.