What term is used to define vision that is impaired but not completely lost?

The term "Low Vision Patient" is used to describe individuals who experience significant vision impairment that cannot be fully corrected with standard glasses, contact lenses, or medical intervention. This condition means that while the individual does have some remaining sight, their visual acuity is not sufficient for everyday tasks without assistance or adaptations.

In essence, a low vision patient typically requires specialized aids or services to help them maximize their remaining vision and maintain an independent lifestyle. This can include tools like magnifying glasses, specialized computer software, or orientation and mobility training.

The other terms in the question refer to different aspects of vision: a monocular patient has vision in only one eye, acuity refers to the clarity or sharpness of vision, and anisocorea describes a condition where the pupils are of unequal size. These options do not encapsulate the full scope of visual impairment as defined under the term for low vision.