pupilától

Pupilától 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 eye and reach the retina. Its size can change in response to the amount of light in the environment. In bright light, the pupil constricts to a smaller size, reducing the amount of light entering the eye and improving image clarity. In dim light, the pupil dilates, or enlarges, to allow more light to enter, which enhances vision in low-light conditions. This change in pupil size is an involuntary reflex controlled by the muscles of the iris. The color of the pupil itself is always black because the light that enters the eye is absorbed by the tissues at the back of the eye, such as the retina and choroid, and very little is reflected back out. Variations in pupil appearance or reactivity can sometimes indicate underlying medical conditions, and this is why eye examinations often include observing the pupil's response to light.