Low vision
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Low vision is alternatively a general term used to describe lowered visual acuity, and a specific legal term in Canada and the US used to designate someone with vision of 20/70 or less in the better eye with correction.
Most people who fall into this category can use their considerable residual vision - their remaining sight - to complete daily tasks without relying on alternative methods. This residual vision may be augmented through the use of optical devices such as magnifying glasses and monoculars.
Some people with significantly reduced acuity may benefit from ‘functional vision assessments’ conducted by individuals trained in the provision of technical aids. Low vision specialists, most of whom are connected to an agency for the blind or to a specific vendor, can provide advice on the best lighting and contrast to maximize remaining vision. These professionals also have access to more unusual vision and non-visual aids, and can instruct customers in their uses.
Visually impaired consumers may benefit from high-tech aids such as OCR scanners that can, in conjunction with text-to-speech software, read the contents of books and documents aloud via computer. Vendors also build closed-circuit televisions that electronically magnify paper, and even change its colour contract, for visually impaired users.