Accomodation Is the ability of the eye to clearly see objects at different distances, which is due to the coordinated work of the lens, the ciliary ligament and the ciliary (ciliary) muscle.
Spasm of accommodation Is a pathology of vision, which is also called false [/b]nearsightedness [b] or tired eye syndrome. Spasm of accommodation is more often manifested in children, but adults can suffer from it. It appears with prolonged exertion on the eyes - frequent and long work at the computer, long reading, work with a job that requires visual tension (watchmaker's work, jeweler, embroidery).
The main symptoms of accommodation spasm are very similar to the symptoms of myopia - pain in the eyes, their rapid fatigue, reduced visual acuity in the distance.
The eye is an optical system that, in order to correctly position the focus on the selected object, is in a movable state. Its action is similar to the work of binoculars, equipped with a special device for adjusting the clarity of the image. In each eye this function is performed by the ciliary muscle. With its help, the lens of the eye is able to move to choose the appropriate image focus on the retina. With prolonged visual stress, the ciliary muscle "gets tired", because of which the eye loses its ability to respond to changes in the focal length.
The spasm of accommodation arises as a result of visual fatigue, as a result of which a person does not see well in the distance. This is a reversible process, because of what the spasm of accommodation is called false myopia. However, if a person does not pay proper attention to the spasm of accommodation, delaying the visit of an ophthalmologist, false myopia may become true.
Causes of accommodation spasm
The main stimulus for the appearance of the accommodation reflex is the defocusing of the image on the retina of the eye. Under optimal conditions of illumination, light rays emanating from a closely located object are not focused on the retina. Brain-sensing defocusing involves an accommodation mechanism. The nervous impulse transmits a signal to the ciliary muscle. It contracts, the tension of the zinn ligaments decreases, as a result of which the lens changes its curvature, and the focus of the image moves to the retina. If you look at the distance, the image focus returns to the retina, there is no signal about defocusing, a nerve impulse does not flow, the ciliary muscle relaxes, the tension of the zinn ligaments increases, the lens reduces the curvature and becomes flat again.
Symptoms of false nearsightedness
Age and akkamodatsiya
The main condition of normal accommodation is the elasticity of the lens, which varies with age. In childhood, the lens exhibits the highest accommodation properties. Over time, the elasticity of the lens decreases, and after 40-45 years the ability to see close close decreases, develops. age-long-sightedness . In many cases, by the age of 60-70 the ability to accommodate is completely lost.
In the twilight time of the night accommodation, which provides vision to the distance, disappears. Because of this, in the evening and night time there is uncomfortable sight (bad vision).
Treatment of spasm of accommodation
Currently, spasm of accommodation is the main reason for the development of myopia in children. Today, this problem can be eliminated not only with the help of eye drops that promote the dilatation of the pupil, and eye exercises. Special computer programs have been developed that make it possible to relieve visual tension, various kinds of magnetic, laser and electrostimulation.
In addition, physical activity, a balanced diet enriched with carotene and vitamin C, and vitamins with lutein to improve vision are necessary. It is useful to undergo twice a year a course of general massage, since scoliosis is one of the causes of false myopia.
Early prevention and timely treatment of spasm of accommodation makes it possible to prevent the development of myopia.