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One more aspect of harm of carrying of glasses with optical lenses is marked in C.L.Tomsona's work. It{he} writes: *Нормальная, the healthy muscle remains those only in case she{it} is frequently started up in business and if its{her} amplitude of movement is used completely. Any muscle which is used only in a small part of its{her} amplitude, is predisposed to утере abilities is high-grade to move. In this aspect glasses in part harmful as instead of watching or looking{keeping up or looking} behind any object only eyes, the tendency to move is observed by a head. Eyeballs, thus, be relative обездвиживаются, and their muscles and blood circulation suffer as a result of a divergence. Told by Thomson especially truly when speech comes about monotonous work in glasses on close distance, for example, reading. In these cases of an eye are borrowed{occupied} with identical movements practically in the same direction (to the left - to the right) and with the small amplitude limited in width of a line in the book. For indemnification of a pressure{voltage} arising at it special exercises are developed. Подробнее...

The fact of deterioration of sight at carrying glasses so speaks M.D.Korbett: *Когда the healthy eye is weakened, it{he} will correctly function. Similarly to a camera it{he} will be уплощаться, reducing the axis at examining the removed objects and to be extended in the axis at examining close objects. Only the pressure{voltage} prevents an eyeball to undergo similar changes in the form. Instead of muscles of an eye glasses therefore eye muscles cease to carry out the functions start to do{make} this work and start to weaken gradually. Подробнее...