asthenopia muscle

Asthenopia muscle. Etiology, pathogenesis. Myopia, Heterophoria, weakness of convergence insufficiency fusional reserves; often a combination of these reasons. If uncorrected myopia work at close range is accomplished almost without tension of ciliary muscle, but requires convergence. As a result of the dissociation between accommodation and convergence appear weakness, rapid fatigue of internal rectus muscles. When Heterophoria and weakened ability asteiopicheskie occur be- tween phenomena arise from neuromuscular surge to overcome the tendency to deviation of one eye.

Symptoms within. Eye fatigue, eye pain and headache, transient diplopia when visual work at close range. These phenomena are quickly eliminated if to cover up one eye.

Diagnosis is based on characteristic complaints, identify myopia or Heterophoria. It is also necessary to investigate the fusional reserves.

Treatment, prevention. Early optical correction of myopia. Creation of favorable hygienic conditions of visual work. Exercises (on sinoptofore or through prisms) for the development and convergence of the normal fusion amplitude. At high degrees of Heterophoria - wearing glasses with prisms, the apex directed toward the eye deviation. If time does not take treatment measures, the binocular vision is disturbed and may appear cross-eyed.

The prognosis for timely treatment favorable.