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On a stage of process allocate initial, advanced, it is far зашедшую, almost absolute and absolute G.Pri initial Г. visual acuity and a field of vision are not changed. Advanced Г. it is characterized by narrowing of a field of vision on 15-20 °; at far зашедшей Г. there is more significant narrowing a field of vision usually with носовой the parties{sides}. Almost absolute Г. it is characterized by the lowered sight, and it is kept only from the temporal party{side}, at absolute Г. is absent even светоощущение. Deterioration of visual functions at Г. is connected with атрофическнми changes in an optic nerve. Подробнее...

To development Б. promote негпгие-нические conditions of visual work (bad illumination, work on close distance and so forth). Hereditary predisposition to Б. can matter at presence of adverse conditions. Б. usually starts to develop in school days, with the years a degree of her{it} can grow. Подробнее...