Vision impairment
Vision Impairment
Vision impairment (pronunciation: /ˈvɪʒən ɪmˈpeərmənt/), also known as visual impairment or vision loss, is a decreased ability to see to a degree that causes problems not fixable by usual means, such as glasses or medication.
Etymology
The term "vision impairment" is derived from the Latin words "visio" meaning "sight" and "impedire" meaning "to hinder".
Definition
Vision impairment is a term used to describe any kind of vision loss, whether it's someone who cannot see at all (blindness) or someone who has partial vision loss. Some people are completely blind, but many more have what's called legal blindness. They have a 20/200 degree of vision or less, which means they can see at 20 feet what someone with normal vision can see at 200 feet or they have a restricted field of vision less than 20 degrees wide.
Causes
Vision impairment can be caused by several factors, including eye diseases such as glaucoma, macular degeneration, and cataract. Other causes include eye injuries, genetic conditions, and certain systemic diseases such as diabetes or multiple sclerosis.
Related Terms
- Blindness: The state or condition of being unable to see because of injury, disease, or a congenital condition.
- Low Vision: A significant visual impairment that can't be corrected fully with glasses, contact lenses, medication, or eye surgery.
- Legal Blindness: A level of vision loss that has been legally defined to limit a person's ability to perform certain tasks.
- Visual Acuity: Clarity or sharpness of vision, which might be affected in vision impairment.
See Also
External links
- Medical encyclopedia article on Vision impairment
- Wikipedia's article - Vision impairment
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