Pupil dilation

Pupil dilation is the enlargement of the pupils, typically in response to a stimulus, such as light or emotions. It is a reflex that occurs when the iris muscles contract or relax, changing the size of the pupil. It is a normal response that can be seen in both eyes, although it may be more pronounced in one. Pupil dilation can manifest in a variety of ways, including increased sensitivity to light, blurred vision, and difficulty focusing. It can also indicate an underlying medical condition, such as an infection or an injury.