The structures of the eye include vitreous humor, retina, sclera, choroid, macula, ciliary body and iris, etc. The specific functions are as follows. 1. Vitreous humor: It is the main component of refractive interstitium, which plays a supportive role for retina, buffers the external force as well as anti-vibration, and also inhibits the proliferation of many kinds of cells and maintains the stability of vitreous humor. 2. Retina: The important function of the retina is the formation of vision, color vision, i.e. imaging function. 3. Sclera: the function of the sclera is to protect the contents of the eyeball, maintain the intrinsic shape of the eyeball, and keep the refractive function of the visual organ. 4. Choroid: its main function is to nourish the outer vitreous layer of the retina, block light and make the reflected image clear. 5. Macula: It plays an important role in both fine vision and color vision. 6. Ciliary body: the function of the ciliary body is to adjust the curvature of the lens and the refractive ability. 7. Iris: The function of the iris is to automatically adjust the size of the pupil and the amount of light entering the eye. In addition to the above structures, the eye also has structures such as the wall of the eyeball and the lens. It is important to note that if eye discomfort occurs on a daily basis, you should seek medical attention in a timely manner to avoid delays.