pupillán

Pupillán is a term that refers to the pupil of the eye. The pupil is the dark, circular opening in the center of the iris that allows light to enter the retina. Its size is controlled by the iris, which acts like a diaphragm, constricting in bright light to reduce the amount of light entering the eye and dilating in dim light to maximize light entry. This mechanism helps to regulate the amount of light reaching the retina, ensuring clear vision in varying light conditions.

Changes in pupil size can be indicative of various physiological and neurological states. For example, pupils may dilate in response to fear or excitement due to the release of adrenaline. In medical contexts, pupil response is a crucial part of neurological examinations to assess brain function and detect potential injuries or conditions. The size and reactivity of the pupils are often checked using a light source. Abnormalities in pupil size, shape, or movement can signal underlying health issues.