Structure Of The Eye

The most important structures are the lens and it’s retina
The wall of the eyeball consists of 3 layers
*The outermost sclera
*The middle choroid
*The innermost retina

The Sclera is a white tough layer of connective tissue which protects and maintains the shape of the eyeball. It bulges out in front to form the transparent cornea. At the back, it is perforated by the optic nerve. A thin transparent membrane, the conjunctival, lines the inside of the eyelids and cover the cornea protectival.
The chroid consist of black pigmented cells, and has a rich supply of blood capillaries. In front, it forms the muscular ciliary body and the iris. Suspensory ligament from the cilliary body hold the lens in place. The lens is a transparent, bioconvex structure which is flexible. The space in front of the lens is filled with watery aqueous humour. The much bigger space behind is filled with the jelly like vitreous humour, which helps to maintain the spherical shape of the eyeball. The iris is the coloured opaque disc muscular tissue that lies in front of the lens. The hole in the centre of the iris is called the pupil. Light enters the eye through the pupil.