The eyeball is the spherical part of the eye that contains the structures responsible for vision. It is approximately one inch in diameter and is located in the eye socket, also known as the orbit.

The outer layer of the eyeball is composed of the sclera, which is the white part of the eye, and the cornea, which is the clear, dome-shaped surface at the front of the eye. The middle layer is composed of the choroid, ciliary body, and iris, which help to regulate the amount of light entering the eye and to focus light onto the retina. The inner layer is the retina, which contains the photoreceptor cells that convert light into electrical signals that are sent to the brain via the optic nerve.

The shape of the eyeball is important for focusing light onto the retina. If the shape of the eyeball is too long or too short, it can cause refractive errors such as myopia (nearsightedness) or hyperopia (farsightedness).

The eyeball is also susceptible to a number of conditions and diseases, such as cataracts, glaucoma, and macular degeneration. Regular eye exams and proper eye care are important for maintaining good eye health and catching any potential problems early.

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