Scotoma

Scotoma - insulated blind area in the field of viewthat is not related to its peripheral borders. Scotoma is an important diagnostic symptom of diseases of the eye and brain vessels.
The scotoma are distinguished by place of provisions in the field of view, the form, size. Physiological scotoma is a blind spot that exists in sight of each healthy eyes. It is a projection of the field of view of the optic nerve, not having svetovosprinimayuschih elements. When the so-called positive scotoma patients felt a dark spot; if negative the scotoma is a defect in the field of view is subjective is not felt. Often there is the so-called atrial scotoma, in which there is a flicker on a path scotomas, interferes with vision. This scotoma lasts 30 minutes - 2 hours, ending a strong headache, often with nausea, vomiting.
Usually scotoma appears in diseases of the retina and optic nerve (pigmentary retinal degeneration, glaucoma, atrophy of the optic nerves, and others).
The scotoma is determined by campimetria and perimetric studies (see).