DR Medhat MRCP

- Layers of the eyeball :
Sclera :
o Firm , fibrous, protective layer seen in the front of the eye as white of the eye.
o Connected anteriorly to a transparent cornea which allow passage of light.
o Covered with transparent layer called conjunctiva.
Uvea :
o Intermediate layer containing blood vessels,nerves & pigmented cells.
o Divided into 3 main regions :
‣ Choroid : extends from optic nerve entry to the front of the eye where it
forms ciliary body and iris
‣ Ciliary body : to which the lens is attached via fibrous ligament.
‣ Iris : gives the eye its color, constricts & dilates according to the light.
Retina :
o The innermost layer of the eye whichlines about 3/4 of the eyeball.
o Full of photosensitive cells (rods & cons) which transmit the image to optic
nerve which arises from optic disc.
o Macula lutea is a yellow area of the retina situated in posterior part with a
central depression called fovea centralis. It is the most sensitive part of retina.
Fundus of the eye :
- It is the interior surface of the eye, opposite the lens, and includes the retina, optic disc,
macula and fovea, and posterior pole.
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