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Eye pain and strain
When the muscles work together but inefficiently then Eye Strain develops. Along with eyestrain, diplopia that is double vision and fatigue may also occur. In case of eyestrain, the eyes usually work together but poorly. It has been known that people suffering from strabismus does not show any symptoms of eyestrain.
Causes of Eye strain :
(a) Convergence insufficiency:
This is the most common eye muscles disorder. It is present in near about 4% of the population. It is characterized by an inability of an individual to converge or look close for long periods of time.
Commonly the patient has a tendency for one of the eyes to drift outward while reading or doing close work. Sometimes the eye actually drifts with resultant double vision. The effect to keep the eyes working together results in eye strain, fatigue car sickness, headaches, double vision, blur, loss of concentration, etc.
(b) Divergence Insufficiency:
It is a very rare eye muscle problem in which there is a tendency for the eyes to turn inward at distance. It is a toughest case and it is very has to teach divergence, that is turning out of the eyes.
(c) Convergence excess: In some cases the eyes have a tendency of point too close at near objects, that is, those are over coverage.
(d) Divergence excess: -
It is the tendency for the eyes to turn outward at a distance. It rarely causes eyestrain but usually it breaks into a strabismus.
e) Esophoria: Eyes tend to over converge at distance is not too large then vision therapy is effective but if too large of a tendency to turn then surgery may supplement therapy.
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