Visual impairment or vision impairment is vision loss that constitutes a significant limitation of visual capability resulting from disease, trauma, or a congenital or degenerative condition that cannot be corrected by conventional means, including refractive correction, medication, or surgery.
Anyone with non-correctable reduced vision is considered to be visually impaired, and can have a wide range of causes.
Blindness is the condition of lacking visual perception due to physiological or psychological factors.
Hearing impairment is a full or partial decrease in the ability to detect or understand sounds. Losing the ability to detect some frequencies, or very soft sounds, that one naturally detects, creates some form of hearing impairment.
A physical disability is a condition or function judged to be significantly impaired relative to the usual standard of an individual or their group.
A person with a cognitive disability has greater difficulty with one or more types of mental tasks than the average person. Certain perceptual and reasoning skills may be strengthened with the use of off-the-shelf grammar checking and dictionary software.