What can indicate an abnormal pupil size, such as aniscoria?

An abnormal pupil size, particularly anisocoria, is characterized by the presence of pupils that are unequal in size. This condition can be a normal variation in some individuals, but it can also indicate a potential underlying medical issue, such as neurological disturbances or eye injuries.

Different sizes of pupils directly reference the defining characteristic of anisocoria, making this option the most relevant to the question. The presence of unequal pupil sizes should prompt further examination to determine if there are any associated causes or health implications.

The other choices involve symptoms or signs that may relate to other eye or health conditions but do not specifically pertain to the characteristic of anisocoria. Excessive tearing, flickering sensitivity to light, and color changes in the iris indicate different types of ocular or neurological issues rather than pointing to pupil size discrepancies. Consequently, while they may suggest other medical conditions or concerns, they do not describe what constitutes anisocoria itself.