Night blindness (night blindness)

Night blindness (night blindness, night blindness) - (night blindness, night blindness) -rasstroystvo twilight vision.

Etiology of congenital night blindness is not enough clear. The cause of night blindness is essential vitamin deficiency or Vitamin A deficiency, as well as B, and PP. Symptomatic day-blindness is observed in diseases of the retina and optic nerve.

Pathogenesis: disrupted the process of restoring visual purple.

Symptoms. Impaired vision and spatial orientation in the twilight. Lowering the light sensitivity, disturbance of the process of dark adaptation, change electroretinogram, visual field loss, especially in color. Diagnosis is based on complaints, clinical, study of dark adaptation and electroretinography.

Treatment. Congenital day-blindness can not be treated. When symptomatic treatment of night blindness, the underlying disease. In essential night blindness - vitamin A inside: adults 50 000 to 100 000 IU / day, children from 1000 to 5000 IU / day; riboflavin simultaneously to 0.02 g / day.

Forecast. In congenital night blindness persistent lowering of view. In the case of night blindness essential favorable prognosis in symptomatic night blindness it depends on the course and outcome of the underlying disease.