why do you see that black spot in the middle when you look at something bright

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why do you see that black spot in the middle when you look at something bright

In: Biology

The black spot you see in the middle WHEN you look at something bright is due to the optic nerve in the back of your eyeballs having no photoreceptors on it.

The black spot you see AFTER you’ve looked at a bright light is due to your brain damping the signals from the photoreceptors that are getting the bulk of the bright light shine on them. This takes about 10 minutes for your brain to bring back up to full sensitivity.

Eye patches on pirate-day sailors were often used so that a sailor could switch the patch from one eye to the other when they went belowdecks and not be blinded by the darkness because the exposed eye was already adjusted to the dark.