What does anisocoria refer to?

Anisocoria specifically refers to a condition where there is a noticeable difference in size between the two pupils. This phenomenon can occur due to various reasons, such as neurological issues, eye injuries, or certain medical conditions that affect the muscles controlling pupil size. The presence of unequal pupils is important in clinical practice as it may indicate underlying health concerns that need to be evaluated further.

In contrast, the other options point to concepts that are unrelated to the definition of anisocoria. Color vision deficiency pertains to difficulties in perceiving colors and is unrelated to pupil size. Equal pupils describe a normal scenario where both pupils exhibit the same diameter, which would be the opposite of anisocoria. Lastly, a normal pupil reaction to light indicates that both pupils react appropriately by constricting in response to light exposure, further emphasizing that anisocoria is defined by the lack of uniformity rather than normality in pupil responses.