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The structure of the eye is composed of the main parts of the eye, the eye ball, the eye ball wall, and its contents, which are roughly spherical and located in the orbit. The eye ball wall is layered, with the fibrous membrane, vascular membrane, and retina from the outside to the inside. The eye ball contents are some colorless transparent refractive structures within the eye, including the lens, aqueous humor, and vitreous body, which together with the cornea form the eye's refractive system. The eye ball is approximately spherical, formed by two spheres with different curvature radii. The adult eye ball...