The wall of the eyeball is composed of 3 concentric layers:
Sclerotic
Choroid
Retina
The wall of the eyeball is composed of 3 concentric layers:
(1) Outer sclerotic: The sclerotic layer or sclera is the outermost layer of tissue, also called the white of the eye. This layer is a very stable fibrous membrane that continues to retain the shape of the eye and provides protection.
(2) Middle choroid: The choroid is a dark brown vascular coat of the eye between the sclera and the retina. When light penetrates the pupil and focuses on the retina, nerve endings are triggered and then absorbed by the choroid.
(3) Inner retina: The retina is a delicate, multilayer, light-sensitive membrane lining the inner eyeball. This layer is highly sensitive to light and is the layer of rods and cones when the light hits the retina photosensitive pigments within the rods and cones, it converts light rays into nerve impulses.