Starry-eyed
Question: Why do we see stars when we receive a blow to the head?
Answer: Our retina can only respond to stimuli in one way: by sending a
signal along the optic nerve to the brain,which interprets this signal as light.
Normally, the stimulus is light impinging on the retina, but other stimuli work
too.
One of the commonest is a mild trauma to the eyeball. If you close your eyes
in a dark room and press gently on the front of your eye you will see a faint
glow in your peripheral vision. This can also happen…
