What is the role of the blood vessels in the eye?

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The main idea is that blood vessels supply the eye with oxygen and nutrients and carry away waste products, supporting the metabolism and health of eye tissues. They form a network that nourishes structures like the retina, iris, and ciliary body, helping maintain vision and tissue function while also aiding immune protection and repair. Other options describe parts that aren’t primarily about supplying blood: eyelid movement is controlled by muscles, tear production comes from glands, and the white of the eye is the sclera. (Note: the cornea lacks blood vessels and gets nutrients differently, but in general the vessels in internal eye parts provide essential nourishment and waste removal.)