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.
Visual Impairment. Much like low vision, there are many different definitions of visual impairment. Visual impairment is a general term that describes a wide range of visual function, from low vision through total blindness. Here is an example of the variations in the term visual impairment or visually impaired from the World Health Organization Levels of Visual Impairment : Moderate Visual Impairment: