Do You Know? | 2017-11-09 |

Do You Know?

    9 November, 2017 12:00 AM printer

Do You Know?

•    The first vision correction device was invented in 1000AD, and called a reading stone. As you can imagine, it was for farsighted folk who couldn’t read properly, and was basically a glass sphere used as a magnifying glass.
•    The first sunglasses, however, date back to 12th century China, where flat crystals of smoky quartz were mounted for personal use to reduce the glare from the sun.

It is also said that these ‘sunglasses’ were used by judges while presiding cases, so as not to give away their emotions. This is the earliest record of sunglasses using ‘lenses’.
•    In reality, the first prescription ‘lenses’ were actually similar to contact lenses! Records from 13th century Italy show that glass lenses were used to correct vision, but instead of mounting them in front of the eyes, they were placed directly into the eyes!
•    You might remember Benjamin Franklin as one of two things, either as a founding father of the United States of America, or the guy who performed the lightning rod experiment. What many people don’t know, however, is that Benjamin Franklin was also the inventor of bifocals. He was both myopic and hypermetropic, so he developed these special lenses to help him see better.
•    It may sound trivial, but the term ‘glasses’ doesn’t really make much sense now. The name originated from the fact that most corrective lenses were actually made of glass. But nowadays, glass is becoming increasingly rare as a lens material because of how fragile it is. Most eyeglasses today are made from some variety of plastic.