The globe of the eye is located in the orbital cavity. It has a spherical shape with an average diameter of 0.94 inches (24 mm) and a weight of 0.25 oz to 0.28 oz (7 to 8 grams).
The eye has three layers:
- An outer layer called the sclera;
- A middle layer called the choroid;
- An inner layer called the retina.
The sclera is a tough white connective tissue capsule, which is anterior of the transparent cornea and protects the eye from injuries. It is opaque so the light can only enter through the pupil.
The choroid ensures the blood supply of the eye.
The pupil is located in the centre of the iris, and behind it is the lens of the eye.
The ciliary muscle determines the shape of the lens.
The fovea is located on the retina and is the location where the incoming light focuses.
The image is converted into an electronic signal and sent to the brain via the optic nerve.
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