What is the function of the choroid layer in the eye?

The choroid layer plays a critical role in eye health and function, primarily by providing nourishment to the retina. It is a vascular layer situated between the retina and the sclera (the outer layer of the eye), rich in blood vessels that supply oxygen and nutrients essential for the metabolic needs of the retinal cells. Additionally, the choroid contains melanocytes, which produce pigment that absorbs excess light entering the eye. This absorption prevents light scatter, enhancing the clarity of the visual image and protecting the sensitive retinal tissues from potential damage caused by excess light. Therefore, its dual function of nourishment and light absorption is vital for maintaining optimal vision and overall eye health.