![]() By closely observing facial expressions, body language and tone of voice, practically anyone can recognise the tell-tale signs of lying. Luckily, nature provides more than enough clues to trap dissemblers in their own tangled webs- if you know where to look. A person able to spot falsehood quickly is unlikely to be swindled by an unscrupulous business associate or hoodwinked by a devious spouse. So it may come as no surprise to learn that human beings- who, according to psychologist Gerald Johnson of the University of South California, or lied to about 200 times a day, roughly one untruth every 5 minutes- often deceive for exactly the same reasons: to save their own skins or to get something they can’t get by other means.īut knowing how to catch deceit can be just as important a survival skill as knowing how to tell a lie and get away with it. Nature amply rewards successful deceivers by allowing them to survive long enough to mate and reproduce. Spider crabs do it by disguise: adorning themselves with strips of kelp and other debris, they pretend to be something they are not – and so escape their enemies. Birds do it by feigning injury to lead hungry predators away from nesting young. With time, successful ad campaigns and Hollywood stars’ adaption, they became a fashion statement.However much we may abhor it, deception comes naturally to all living things. The same year, aviator sunglasses were built by Ray Ban using the Polaroid lens for the World War II American soldiers. Land, co-founder of the Polaroid Corporation. In 1936, Polaroid lens filter (which filters harmful rays such as UV rays before reaching our eyes) was invented by Edwin H. In 1929, Sam Foster, founder of Foster Grant, started mass production of sunglasses and it started gaining traction. Till that time, sunglasses were not meant for protection against harmful rays. Sunglasses, as we see now, started appearing in the 20th Century. It was replaced by strong plastics thereby changing the style of the eyeglasses drastically. Initially, these glasses were made with wooden frame. ![]() It was only after the industrial revolution, the lenses and the frames were mass-produced, effectively helping many people with vision impairments. On one side, several scientists were developing these glasses but on the other side, there was no manufacturing at scale. The 18th Century came in and experiments were done with blue/green tinted lenses to improve poor eyesight by James Ayscough, an English Optician. He achieved that by placing one half of the convex lens with another half of the concave lens. Concave lenses are used for correcting nearsightedness and the convex lenses, for correcting farsightedness.īenjamin Franklin invented the bifocal lenses, which are used for correcting both nearsightedness and farsightedness. In the late 17th Century, people understood the working principle of the concave and the convex lens. The development that took place after 17th Century Giordano da Pisa, Dominican friar, 1306. … I saw the one who first discovered and practiced it, and I talked to him.” “It is not yet twenty years since there was found the art of making eyeglasses, which make for good vision… And it is so short a time that this new art, never before extant, was discovered. Owning eyeglasses were regarded as a status symbol for intelligence and prosperity. The discovery of corrective glasses was highly regarded and welcomed. ![]() Renaissance artworks serve as the best testimony, showing us the discovery and the growth in popularity of eyeglasses during that period. Glasses were mostly used by monks of those times and grew in popularity among Europeans during the renaissance period (14th - 17th Centuries). But several hypotheses point that Europeans got their hands on the eyeglasses through the Arabs. Many historians believe that the magnifying glasses with frames were first made in Pisa, North Italy. Portrait of Hugh of Saint-Cher by Tommaso da Modena in 1352 One of the earliest illustration of a man wearing eyeglasses.
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