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Posted by Eye Glasses Arizona | Category:Eye Doctor, Eye Glasses Arizona, Medical, Ophthalmology
History of EyeGlasses in Arizona
The earliest historical reference to magnification dates back to ancient Egyptian hieroglyphs in the 5th century BC, which depict “simple glass meniscal lenses”. The earliest written record of magnification dates back to the 1st century AD, when Seneca the Younger, a tutor of Emperor Nero, wrote: “Letters, however small and indistinct, are seen enlarged and more clearly through a globe or glass filled with water”. Emperor Nero is also said to have watched the gladiatorial games using an emerald as a corrective lens.
Corrective lenses were said to be used by Abbas Ibn Firnas in the 9th century, who had devised a way to produce very clear glass. These glasses could be shaped and polished into round rocks used for viewing and were known as reading stones. The earliest evidence of “a magnifying device, a convex lens forming a magnified image,” dates back to the Book of Optics published by Alhazen in 1021. Its translation into Latin in the 12th century was instrumental to the invention of eyeglasses in 13th century Italy.
Robert Grosseteste‘s treatise De iride (“On the Rainbow”), written no later than 1235, mentions using optics to “read the smallest letters at incredible distances”. A few years later, Roger Bacon is also known to have made one of the first recorded references to the magnifying properties of lenses in 1262.
Sunglasses, in the form of flat panes of smoky quartz, protected the eyes from glare and were used in China in the 12th century or possibly earlier. However, they did not offer any corrective benefits.
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