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Sunglasses or sun glasses are a visual aid that has feature lenses colored or darkened to prevent direct strong light from entering the eyes. Some call them sun-cheaters. As we all know that most people find sunlight either too bright at times or their eyes feel uncomfortable.

Medical experts and eye doctors highly recommend wearing some kind of protection to protect your eyes from the ultraviolet rays that could possibly lead to cataract or some other eye problem. Color shade glasses have become very popular among all ages and for all season, though summer times or at beaches it is more comforting to wear them all the times. It is undoubtedly popular as fashion accessory among celebrities, models and working and non-working people.

Film lighting is typically stronger than natural light and you will often see Hollywood stars protecting their eyes with high quality designer sunglasses in various color shades and style.

Sam Foster first introduced inexpensive mass-produced sunglasses in 1929. They first became polarized in 1936, when Edwin H. Land began experimenting with making lenses with his patented Polaroid filter.

These lenses can improve visual comfort and visual clarity by protecting the eye from glare. Excessive exposure to ultraviolet radiation (UV) can cause short-term and long-term ocular problems such as photokeratitis, snow blindness, cataracts, pterygium, and various forms of eye cancer.

For regular use it is often recommended to wear green, gray, yellow or brown color lenses. Gray lenses are considered neutral because they do not enhance contrast or distort colors. Brown and green lenses cause some minimal color distortion, but have contrast-enhancing properties. Orange and yellow ones have the best contrast enhancement at depth perception but cause color distortion. Golfers and shooters for its contrast enhancement and depth perception properties commonly use yellow ones.

Some people prefer to wear polarized to reduce glare such as from water and fishing people often go for these, as the ability to see beneath the surface of the water is very important.

Sunglass lenses and frames are made from the material either glass or plastic. Plastic lenses are typically made from acrylic, polycarbonate or Polyurethane. Glass lenses have the best optical clarity and scratch resistance, but on the other hand are heavier than plastic ones are more likely to break or get scratching. They can also shatter or break on impact. Plastic lenses are lighter but are more prone to scratching. Polycarbonate plastic lenses are the lightest, and are also almost shatterproof, making them good for impact protection. CR-39 is the most common plastic lens, due to their low weight, high scratch resistance, and low transparency for ultraviolet and infrared radiation.

Buy sunglasses [http://www.optimasunglasses.com/] you really like most and quality should never be compromised and glasses made by top designers are true value to your money.

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Historical Overview Of Sunglasses

Historical Overview of Sunglasses

Sunglasses can be found around every corner you turn today. Visit Here http://newsunglasssale.blogspot.com

You can find them in grocery stores for a few dollars or in specialty stores for a few hundred dollars.  Sunglasses come in so many different shapes, designs and colors that there is a pair out there for everyone.  But the market for sunglasses has not always been this way.  

Sunglasses have been in use for centuries and have evolved over time into what they are today.  They were not always the fashion icon they are today.  Similarly, they were not always used for the same reason they are today either.

Surprisingly, the first form of what we have as sunglasses today were not originally developed to shield eyes from the sun or help poor vision.  In Ancient China, sunglasses were developed out of smoky panes of quartz glass.  Judges wore these prehistoric ray bans as a way of keeping their expressions to themselves.  Little did they know that poker players centuries later would adopt this same principle use of the eyewear.

Ancient Rome can also take part of the credit for today's sunglasses.  The Emporer Nero, while watching gladiator fights enjoyed doing so through polished gems.  It is possible that the Emporer saw the benefits of distorting the sun's beams as a way of seeing more clearly.  It is also possible that he enjoyed these early sunglasses because he thought the gladiators looked better in different colors.  For whatever reason, sunglasses still today are available in any lens color you can imagine.

During the eighteenth century, the design of the sunglasses were altered by an inventor seeking to use color as a vision correctioin.
He was convinced that blue and green tints helped the eye see better when vision was poor.
He had no reason to consider the advantages of shielding the eyes from the sun, as no one knew what a UVA ray was at the time.
It was not common knowledge during this time that the sun could be harmful and cause future vision problems.

Sunglasses were finally introduced in the United States in the early twentieth century, around 1930.  These innovative eye pieces were marketed on the boardwalks of Atlantic City and promised to protect the wearer's eyes from the harmful sun.  It was in this same decade that polarization of the lenses was developed as well.  The inventor of the famed Polaroid camera integrated his Polaroid filter into the makeup of the sunglasses' lenses.  This technology, which is still used today, was the greatest step of its time toward the protection of the eyes from the sun.

Since the 1930's, sunglasses have steadily become a favorite accessory for everyone from the true fashion icon down to the style novice.  Sunglasses have been implemented as a way of showing off one's style, sophistication, and social status.  Individuals have made their own styles famous and timeless.  

The most famous of all the sunglasses style icons is unarguably the late Jacqueline Lee Bouvier Kennedy Onassis, or simply "Jackie O.".  The oversized sunglasses of the same name were a token symbol of the former First Lady and American Icon.  Around the year 2000, Jackie's signature style was made popular again for young women by another style icon, Nicole Richie.

Sunglasses have come a long way over the centuries.  They have evolved in uses, styles, popularity and technology.  With sunglasses what they are today and their importance in popular culture, it is difficult to imagine where and in what form they will turn up next.  Keep your eyes open-and your sunglasses handy-to find out!Visit Here http://newsunglasssale.blogspot.com

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black screen polaroid i533 camera stopped working?

I got my camera last year, it was working fine last week and suddenly when i wanted to take some pictures today the screen was black. It turns on but the screen is not working it looks black. I hook it up on my computer and the pictures i had taken (with the screen still black) showed up fine.
So basically the screen is dark it still turns on and takes pictures, there is a light blinking red and green constantly. what might be wrong? How can I fix it?

send it to polaroid for repairs
it will cost about $150
you decide
fix or new

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