In Austria, one is classified according to medical classification as a blindly on the better eye with optimal correction a visual performance with a visual acuity (visual acuity) of less than or equal to 1 / 60 (2 percent). That is, amounts to a blind person's visual acuity does not exceed 2 percent of the standard. In theory, may be present in a blind man nor a very. Usually this is limited on light and dark perception. The classification of "blind" is also at a higher visual acuity when the visually impaired in addition visual field hinzukommen.Die most common causes of blindness in Europe, the diabetic Retionopathie are (eye damage due to sustained high blood sugar levels), glaucoma (glaucoma) and age-related macular degeneration (damaged nerve cells for the sharp vision). Retinitis pigmentosa (retinal disease) is the most common form of hereditary blindness.
http://kremser.wonne.cc/publik/kfv-unterwegs-im-dunkeln/sites/situationsanalyse.htm
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