Leonardo da Vinci is frequently credited with introducing the general principle of contact lenses in his 1508 Codex of the eye, Manual D, where he described a method of directly altering corneal power by submerging the eye in a bowl of water.
The first suspected recorded use of a corrective lens may have been by the emperor Nero in the 1st century, who was known to watch the gladiatorial games using an emerald.
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