This false myopia. Misleading, because the loss of vision in spasm of accommodation - is temporary and reversible. Otherwise, such a state is called a syndrome of tired eyes. Basically it develops in children and adolescents, it is much less - in adults.
Accomodation in translation into Russian means "adjustment." In contrast to the adaptation devices, in this case the reaction is carried out of active and muscle strength. Therefore, when there is a spasm of accommodation, treatment is aimed at regulating the activities of the ciliary muscles, which are located inside the eye and adjust the curvature of the crystallite.
Normally the eye muscles are relaxed, the lens is flattened, visual acuity focus on distant subjects. When a person sees an object near, ciliary muscles contract, and ligaments, on the contrary, relax. This causes the lens to become convex. This enhances the optical power of 10-12 diopters. Rays of light reflected from the object focused on the retina, as a result, the image becomes clear. When switching over a long distance of the ciliary muscle must relax. However, this does not occur in the pathology. So there is a spasm of accommodation, the treatment which provides relaxation of the muscular apparatus of the eyes.