Retina is made up of 130 million shaped
like Rods for black and white vision and
7 million shaped like cones for colour vision.
When you look at an object , the light passes through the lens,
Which brings it into correct focus on the retina.
A complex chemistry gets underway.
The light bleaches Rhodopsin, a purplish-red pigment in my rods.
This generates a tiny wisp of electricity.
This feeds into my Optic nerve to the brain and you see the object.
All this happens in .002 second.
Isn’t eye wonderful.