How Do Sunglasses Work

You've been told your entire life that sunglasses are important. You know that they protect your eyes, block out the sun's ray and prolong good vision. But have you ever wondered how these miracle shades do all of that? Of course not, but you should learn. Sunglasses basically do four things for you, aside from completing a killer outfit. It is important to know what these things are and how they are done to ensure your sunglasses are doing their job.

As you probably already know, sunglasses provide protection from ultraviolet rays in sunlight. UV rays can cause serious damage to the corneas, and a good pair will shield 100% of these rays. A protective coating on the outside of sunglasses acts as a kind of filter. While it allows light through, it helps to filter out the radioactive light waves that can lead to so many dangers to your eyes.

Possibly the most prevalent purpose sunglasses serve is to provide protection from intense light. Intense sunlight can cause you to squint, a natural reaction to too much light entering the eyes. If squinting does not provide enough protection, damage to the cornea can occur next. This is especially common when outside in the snow without your sunglasses. The white of the snow reflects and magnifies the intensity of the light.

The tinting of your sunglasses will help determine the amount of light your eyes will be exposed to. As there are different types of light, all the colors of the rainbow, different shades of lenses will protect in their own ways. Gray and almost black tinted lenses will offer the greatest amount of protection from intense lights while avoiding distortion of most colors that you see.

Another quality sunglasses carry is something we are all most likely thankful for. They can provide protection from glare. Water and other shiny looking surfaces can produce a glare. These glares can block out other objects, like a car turning out of a parking lot just ahead of you. Good sunglasses can completely eliminate this kind of glare using polarization.

Light waves vibrate just like sound waves do. When a group of light waves come together but are traveling in different directions, a glare occurs. When you are blinded by a glare off of the water or another vehicle's windshield, what you are seeing is a traffic jam of light waves. Polarization filters built into sunglasses are made up of molecules that realign the light waves with each other and eliminate the glare.

As noted before, Sunglasses can eliminate specific frequencies of light. Certain light frequencies can cause blurred vision, while other frequencies enhance contrast between colors. Choosing the right color for your sunglasses lets them work better in specific situations.

Yellow, gold, amber and brown tinted sunglasses are especially good for blocking out blue light. Blue light is the color of light in the spectrum that scatters and causes blurred perception. While the yellow shades can make the rest of the world look a different color, you will see most clearly and detailed through them.

Green tinted sunglasses are better for filtering some blue light and reducing the occurrence of glares. They also offer the highest contrast and greatest visual sharpness of any other colored lens. For this reason, green sunglasses are very popular. Rose colored shades and purple tints offer the best contrast of objects against a green or blue background and make great sunglasses for hunting or water skiing.

Now that you know how sunglasses work you can be a responsible consumer. Know what to look for when choosing your sunglasses. It is not a bad idea to have more than one pair around for different reasons. This is especially true if you spend a lot of time outdoors on a variety of activities. Be responsible about your eyes and learn to protect your vision while it's still yours to protect!

All About Sunglasses

Any time of year, sunglasses should be a part of your daily heath-consciousness routine. Sunglasses are not just for summers on the beach anymore or just for looking cool and mysterious. Designer sunglasses are no longer just for wealthy movie stars. Sunglasses are crucial in protecting your eyes from the permanent damaging effects of Ultra Violet radiation.

Sunglasses in some form have been around for a very long time. Roman Emperor Nero made sunglasses by watching gladiator competitions through polished light emerald green gems held up to his eyes. The true invention of sunglasses was somewhere between 1268 and 1289.

Before 1430, smoky quartz, flat-paned sunglasses were worn by Judges in the Courts of China to conceal any expression in their eyes. Prescription sunglasses were developed in Italy in 1430 and were later used by the Chinese Judges. In the mid 18th Century, James Ayscough developed blue and green corrective lenses, beginning the use of sunglasses for correcting optical impairments.

Until 1730 when Edward Scarlett invented hardened sidepieces, there were problems in keeping eyeglasses propped on the nose. Glasses frames had been made from leather, bones and metal and sidepieces began as silk strips of ribbon that looped around the ears. Instead of loops, the Chinese added ceramic weights to the ends of the ribbons. Benjamen Franklin's invention of bifocal lenses followed in 1780.

By the 20th Century, sunglasses were used to protect the eyes from the sun. In 1929 Sam Foster's "Foster Grants" were the first mass-produced sunglasses and they began the trend of sunglasses for fashion.

In the 1930's the Army Air Corps asked Bausch & Lomb to develop sunglasses that would efficiently reduce high-altitude sun glare for pilots and they came up with dark green tinted sunglasses that absorbed light through the yellow spectrum.

Edward H. Land had invented the Polaroid filter and by 1936 he used it in making sunglasses and soon, sunglasses became "cool." Movies stars began wearing sunglasses to hide behind and for fashion. Aviator glasses became popular with the movie stars and the general public in 1937 after Ray Ban developed the anti-glare sunglasses using polarization. The longer lens was created to give more protection to pilots' eyes from light reflecting off their control panels.

By the 1970's Hollywood stars and fashion designers made a huge impact on the sunglasses market. Clothing designers and stars put their names on glasses and sunglasses and everyone had to have them. In 2007, stars are still hiding behind their oversized designer sunglasses, making fashion statements and protecting their eyes from the harmful effects of the Ultra Violet radiation.
Today's trendy designer sunglasses are a status symbol; however, in order to be fashionable in sunglasses, you do not have to give up quality. Quality designer sunglasses can be polarized to reduce the glare of sunlight reflecting off surfaces like the highway, cars, water or snow. Polarized sunglasses work by blocking off horizontal light reflections and only let in vertical light reflections. The polarization of designer sunglasses makes them fashionable in other areas of lifestyle like golfing, boating, biking, swimming, fishing and aircraft flying.

Marketers of designer sunglasses target children who choose the same hot styles and brand-names as their parents and their idols. Sunglasses for children have Disney and cartoon characters in many colors, shapes and styles. Children's designer sunglasses can also be polarized to block the harmful UV radiation.

With modern technology and improvements, the making of sunglasses continues to evolve. We have gone from holding green gems up to our eyes to Oakley's 2004 sunglasses with digital audio players built in.