Invisible disability, or hidden disability, are defined as disabilities that are not immediately apparent. Some people with visual or auditory disabilities who do not wear glasses or hearing aids, or discreet hearing aids, may not be obviously disabled. Some people who have vision loss may wear contacts.
Invisible Disabilities are certain kinds of disabilities that are not immediately apparent to others. It is estimated that 10% of people in the U.S. have a medical condition which could be considered a type of invisible disability.
According to the Americans with Disabilities Act of 1990 (ADA) an individual with a disability is a person who: Has a physical or mental impairment that substantially limits one or more major life activities; has a record of such an impairment; or is regarded as having such an impairment.
Invisible Disabilities: List & Information - Disabled World