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Among fifth and sixth grade children convergence insufficiency is 13%. In studies that used standardized definitions of convergence insufficiency, investigators have reported a prevalence of 4.2–6% in school and clinic settings.
Convergence insufficiency is a common problem with the eyes, and is the main culprit behind eyestrain, blurred vision, and headaches. [unreliable source?] This problem is most commonly found in children. Near point of convergence (NPC) is measured by bringing an object to the nose and observing when the patient sees double, or one eye deviates ...
Although glasses and/or patching therapy, exercises, or prisms may reduce or help control the outward-turning eye in some children, surgery is often required. A common form of exotropia is known as " convergence insufficiency " that responds well to orthoptic vision therapy including exercises.
Vision therapy (VT), or behavioral optometry, is an umbrella term for alternative medicine treatments using eye exercises, based around the pseudoscientific claim that vision problems are the true underlying cause of learning difficulties, particularly in children.
Convergence insufficiency – near exodeviation greater than distance deviation. These can be due to nerve , muscle , or congenital problems, or due to mechanical anomalies. Unlike exotropia , fusion is possible in this condition, causing diplopia to be uncommon.
Accommodative insufficiency. Convergence insufficiency. Accommodative insufficiency ( AI) involves the inability of the eye to focus properly on an object. Accommodation is the adjustment of the curvature of the lens to focus on objects near and far.
Causes include: Refractive errors. Divergence insufficiency. Convergence excess; this can be due to nerve, muscle, congenital or mechanical anomalies. [1] Unlike esotropia, fusion is possible and therefore diplopia is uncommon.
It refers to a certain range of object distances for which the retinal image is as sharply focussed as possible. Amplitude of accommodation is measured during routine eye-examination. The closest that a normal eye can focus is typically about 10 cm for a child or young adult.
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.
Positive relative accommodation ( PRA) in biology, is a measure of the maximum ability to stimulate eye accommodation while maintaining clear, single binocular vision. [1] This measurement is typically obtained by an orthoptist, ophthalmologist or optometrist during an eye examination using a phoropter. After the patient's distance correction ...
