Mechanism of vision Or Working of eye : The eye has two main parts :

(1) Focusing part or Diopteric part : Cornea, aqueous humour, lens and vitreous humour all act as focusing part. The reflected rays from the object fall on the cornea and get refracted. Maximum refraction at aqueous humour lens and vitreous humour. Finally they get converged at the yellow spot. As the rays have some specific energy, so they cause depolarisation of nerve cells.

(2) Receptive part : It has rods and cones, bipolar nerve cells and ganglionated cells. The receptor part after receiving the stimulus of image transmits into the cells of brain which interprets the image as straight.