Which layer of the eye is responsible for light absorption and reducing glare?

The choroid is the layer of the eye that is responsible for light absorption and reducing glare. It is located between the sclera (the white outer layer of the eye) and the retina. The choroid contains a rich network of blood vessels and is pigment-rich, which helps absorb excess light that enters the eye, preventing it from scattering and causing glare. This function enhances visual acuity by ensuring that more light is directed precisely onto the retina. The pigments in the choroid, primarily melanin, play a crucial role in this absorption process, contributing to optimal vision under varying light conditions.

In contrast, other parts of the eye serve different functions; for instance, the sclera provides structural support and protection, while the cornea is primarily responsible for refracting light as it enters the eye. The iris is involved in controlling the size of the pupil and regulating the amount of light that enters the eye, but it does not play a direct role in light absorption in the same manner as the choroid.