What happen when the retina absorbs light?
Photosensitive cells convert the light energy into electro-chemical signals that are passed through the optic nerve to the brain for interpretation.
When light falls on the retina after being inverted by the lens, the incident light energy is converted by cells called rods and cones into electro-chemical signals.
Rods are useful for recognising low and monochromatic light while cones are useful for recognising bright light and colours.
These electro-chemical signals are then passed via the optic nerve to the brain which then interprets the signals to enable sight.