The eye belongs to the organ of vision, so the structure of the eye is very fine and can be divided into two parts: 1. the wall of the eye, including the cornea, iris, choroid, retina, and sclera, this can form the shape of the eye and maintain the integrity of the eye; 2. the contents of the eye, including the atrial fluid, lens, and vitreous humor, these parts fill the internal structure of the eye. The eye, as an organ of vision, allows a person to see things. Under normal circumstances external light, through the lens and vitreous body, which are refractive media, forms objects that fall on the surface of the retina so that the eye can see clear objects. Problems in any part of the eye can lead to vision loss, so once you have an uncomfortable eye, go to the doctor as soon as possible.