Mathematics. 1  Also called relative maximum, local maximum. the value of a function at a certain point in its domain, which is greater than or equal to the values at all other points in the immediate vicinity of the point. 2  the point in the domain at which a maximum occurs.
For other uses, see Blindness (disambiguation). Visual impairment, also known as vision impairment or vision loss, is a decreased ability to see to a degree that causes problems not fixable by usual means, such as glasses. Some also include those who have a decreased ability to see because they do not have access to glasses or contact lenses.
Topics | Physical Disabilities | Visual Impairments | What is the legal definition of low vision or visual impairment? Low vision and visual impairments are legally stipulated. The definitions may vary from state to state. Typically, visual acuity of 20/200 or less or visual field less than 20 degrees are required. There are many definitions of partial impairment that may affect central acuity (the eye chart) or visual field.