What term describes a difference in size between the two pupils?

Anisocoria refers to a condition in which the pupils of the eyes are of unequal sizes. This anatomical variation can occur for several reasons, such as neurological issues, eye trauma, or simply as a benign genetic trait without underlying disease. Recognizing anisocoria is important in clinical settings as it can provide insight into potential neurological conditions or systemic disorders that may need further investigation.

In contrast, the other terms relate to different ophthalmic conditions. Myopia, commonly known as nearsightedness, refers to a refractive error where distant objects appear blurry while close objects can be seen clearly. Hemianopia is a visual field defect affecting half of the visual field, often due to brain injury or stroke. Presbyopia is the age-related loss of the eye's ability to focus on nearby objects, typically beginning in one's 40s and progressively worsening. Each of these conditions describes various refractive or field defects rather than pupil size discrepancies.