Which layer of the eye is responsible for absorbing excess light and preventing internal reflection?

The choroid is the layer of the eye that plays a crucial role in absorbing excess light and preventing internal reflection. This layer is located between the retina and the sclera and contains a rich network of blood vessels that provide nourishment to the outer layers of the retina. Additionally, the choroid is pigmented, which is essential for its function. The pigmentation absorbs stray light that enters the eye, minimizing reflections that could create visual distortions or interfere with clear vision. This is particularly important in maintaining the quality of the visual signal processed by the retina, as excessive internal reflection can lead to glare and reduced contrast.

The other layers of the eye have distinct roles that do not include light absorption in this manner. The sclera, while it provides structure and protection to the eye, is primarily made of tough connective tissue and does not have the same absorptive qualities. The retina is responsible for capturing light and converting it into neural signals, while the cornea aids in focusing light as it enters the eye but also does not absorb excess light in the way the choroid does.