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Orthoptics is a profession allied to the eye care profession. Orthoptists are the experts in diagnosing and treating defects in eye movements and problems with how the eyes work together, called binocular vision. These can be caused by issues with the muscles around the eyes or defects in the nerves enabling the brain to communicate with the eyes.
The symptoms and signs associated with convergence insufficiency are related to prolonged, visually demanding, near-centered tasks. They may include, but are not limited to, diplopia (double vision), asthenopia (eye strain), transient blurred vision, difficulty sustaining near-visual function, abnormal fatigue, headache, and abnormal postural adaptation, among others.
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. In this condition, amplitude of accommodation of a person is lesser compared to physiological limits for his age. [ 1 ]
Fortunately, when it comes to your vision, staying in good health isn't totally out of your control.
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. [1]
According to WebMD, "There are doctors who may recommend eye exercise for eyestrain, blurred vision, headaches, increased sensitivity to bright light, tired eyes, or difficulty sustaining attention."
Astigmatism: Astigmatic eye may also be associated with accommodative excess. Presbyopia: Early presbyopic eye may also induce excessive accommodation. Improper or ill fitting spectacles: Use of improper or ill fitting spectacles may also cause use of excessive accommodation.
This produces a dark red staining of the muscle fibers given the name "ragged red fibers". While ragged red fibers are seen in normal aging, amounts in excess of normal aging give a diagnosis of a mitochondrial myopathy. [citation needed] Polymerase chain reaction (PCR) from a sample of blood or muscle tissue can determine a mutation of the mtDNA.