Eine "Sehbehinderung" entsteht durch ein wesentlich herabgesetztes Sehvermögen, das sich durch medizinische oder technische Maßnahmen nicht ausgleichen leaves. While can be, for example, at a "normal" short-sightedness, or the full vision mostly restored by a pair of glasses, are with a visual impairment irreparable damage to the organ of vision are the most common zugrunde.Zu visual impairment: cataract and glaucoma, macular degeneration, diabetic retinopathy, retinitis pigmentosa, retinal detachment, and albinism. Can also create visual field defects of corresponding severity of visual impairment. The visual performance of visually impaired people depend largely on the type of eye disease or injury and the progression of the disease-related eye changes. As a result of this change, effects such as tunnel vision, Limitations of peripheral perception, distortions and double images, blurring, color vision disturbances, glare sensitivity, night blindness, etc. auftreten.Als severe visual impairment is someone who the better eye has with optimal correction a vision with a visual acuity of less than or equal to 3 / 60 (5 percent) . The definition of "highly visually impaired" is performed at a higher visual acuity when the party involved additional historical field defects vorliegen.Die definition of "blindness" and "visual impairment" is here to applicable in Austria and medical classification, which of the classification of the particular care needs - are regulated by the Austrian Care benefit laws 6 - serves. The degree of visual impairment is detected by ophthalmologic experts, who takes not only vision but also to any visual field position. Based on the results of the particular care benefit classification is made. may be overlooked but not that vision yet of many additional factors, such as time of day in different lighting conditions, the weather is affected. The effects of similar low vision can be experienced by those affected greatly. Mental and physical condition as well as awareness of the environment play a more significant role. A unique Classification of Sehbehinderungsgrade, as determined by an investigation, is therefore only a snapshot and makes no statement about subjectively perceived feeling.
http://kremser.wonne.cc/publik/kfv-unterwegs-im-dunkeln/sites/situationsanalyse.htm
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