Legal blindness refers to a determination made by healthcare professionals that an individual's vision falls below a certain threshold. A person is considered legally blind if their visual acuity falls below 20/200 or if their field of vision is less than 20 degrees in diameter. However, there are several other phrases used to describe this condition. These synonyms include "visually impaired," "partially sighted," "low vision," and "vision loss." Each of these terms describes a level of impairment in vision that affects an individual's ability to function in their daily life and engage with the world around them.