How it works? (Chapter 19)

From the book – Chapter 19: How Five Senses Actually Work

How it works

Light enters the eye through the cornea and pupil.
The lens focuses light onto the retina at the back of the eye.
Photoreceptors activate: rods detect light and dark and work in low light; cones detect colour (red, green, blue) and work in bright light.
Retinal cells convert light to electrical signals.
The optic nerve carries signals to the brain.
Visual cortex (occipital lobe) processes the information into images.

Key structures: cornea, pupil, lens, retina, optic nerve; occipital lobe.

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