Hubble's Mirror Was Ground Incorrectly

The first wearable lenses appeared around 1286, long before the invention of the microscope or telescope.

In the early 11th century he argued that vision works by light entering the eye and used experiments to show it.

Where the optic nerve leaves the retina there are no light-detecting cells, but the brain fills in the gap.

Light refracts as it enters a drop, reflects off the back and splits into colors as it leaves.