Give an account of the retina of human eye.

Retina is the inner coat of the eye. It consists of
i) pigmented epithelium.
ii) neural portion.
* Neural portion has 3 layers
i. Photoreceptor layer :
* It consists of rods and cones.
* Rods contain rhodopsin and are concerned with dim light vision.
* Cones contain iodopsin and are important in daylight vision and color vision.

* The centre of the posterior portion of the retina is called yellow spot. It has a depression called Fovea centralis with only cones. It helps in sharp vision.
* The region of retina with out rods and cones is known as blind spot.
ii. Bipolar cell layer :
* Consists of bipolar neurons.
iii. Ganglionic cell layer :
* Ganglionic cell axons extend as optic nerve.