Invisible disabilities, also known as hidden disabilities or non-visible disabilities (NVDs), are disabilities that are not immediately apparent. They are typically chronic illnesses and conditions that significantly impair normal activities of daily living.
For example, some people with visual or auditory disabilities who do not wear glasses or hearing aids, or who use discreet hearing aids, may not be obviously disabled. Some people who have vision loss may wear contact lenses.
Disability is the experience of any condition that makes it more difficult for a person to do certain activities or have equitable access within a given society. Disabilities may be cognitive, developmental, intellectual, mental, physical, sensory, or a combination of multiple factors. Disabilities can be present from birth or can be acquired during a person's lifetime. Historically, disabilities have only been recognized based on a narrow set of criteria—however, disabilities are not binary and can be present in unique characteristics depending on the individual. A disability may be readily visible, or invisible in nature.
The United Nations Convention on the Rights of Persons with Disabilities defines disability as including: