Glossary

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Late-Life Disability(also: Age-Related Disability, Acquired Age-Related Disability)

Disability that develops gradually as a person ages, including changes in vision, hearing, motor control, and cognition. Unlike disabilities present from birth or acquired through injury, late-life disabilities often develop incrementally, and individuals may not identify as…

Legal Blindness(also: Legally Blind)

A level of vision loss defined in many countries as visual acuity of 20/200 or less in the better eye with best correction, or a visual field of 20 degrees or less. Legal blindness does not necessarily mean total blindness — many legally blind people have some residual or…

Lewy Body Dementia(also: LBD, Dementia with Lewy Bodies, DLB)

A type of progressive dementia caused by abnormal protein deposits called Lewy bodies in the brain. Lewy body dementia affects thinking, movement, behavior, and mood, and is the third most common cause of dementia after Alzheimer's disease and vascular dementia. Symptoms include…

Loudness Recruitment(also: Recruitment, Hyperacusis-like Recruitment)

Loudness recruitment is a common consequence of sensorineural hearing loss in which the range between 'just audible' and 'uncomfortably loud' sounds is compressed — quiet sounds are harder to hear, but sounds above threshold grow louder more rapidly than in a typical listener.…

Low Vision(also: Partial Sight, Partially Sighted)

A visual impairment that cannot be fully corrected by glasses, contact lenses, medication, or surgery, but where some usable vision remains. Low vision encompasses a wide range of conditions and severity levels, typically defined as visual acuity between 20/70 and 20/400 in the…

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