When did humans start to improve vision?
Scientists suppose that the first vision aid, called a reading stone, was invented around 1000 AD. The reading stone was a glass sphere that was laid on top of the reading material to magnify the letters.
One of the earliest historical reference to magnification dates back to ancient Egyptian hieroglyphs in the 5th century BC, which depict "simple glass meniscal lenses".
The written record of magnification also dates back to the 1st century AD, when Seneca the Younger, a tutor of Emperor Nero of Rome, wrote: "Letters, however small and indistinct, are seen enlarged and more clearly through a globe or glass filled with water". Nero is also said to have watched the gladiatorial games using an emerald as a corrective lens .
According to researchers, spectacles were invented more than 1000 years ago in ancient China and were in widespread consumer use in by the Chinese Imperial family, aristocrats and rich civilians.
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