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Friday, December 31, 2010
Photochromic Sunglasses
Photochromic Sunglasses
The lenses which darken on exposure to ultraviolet (UV) radiation are known as photochromic lenses. In the absence of UV rays, the darkened lenses return to their transparent or clear state. When such lenses are prescribed to a person for usage, they are called photochromic sunglasses. They are also referred to as transitional or photochromatic lenses. The photochromic sunglasses are generally made of glass, polycarbonate, or some other kind of plastic.
The glass version of photochromic lenses was developed by Corning in the 1960s. Plastic versions of this type of lenses is also available. They are commonly meant for commercial usage. Such sunglasses benefit regular users of eye lenses a lot. It prevents them from carrying two or three pairs of eyeglasses while going out. You might be wondering how photochromic sunglasses change their color on getting exposed to UV rays. To learn about this along with some advantages and disadvantages of photochromic sunglasses, keep reading.
Photochromic Sunglasses: An Introduction
The reason behind the ability of the photochromic sunglasses to change their color from light to dark is its molecular structure and the effect of light on it. The polarized photochromic sunglasses contain millions of molecules of substances like silver chloride or silver halide. These molecules are transparent to visible light or in the absence of UV light. When they are exposed to UV rays, a chemical reaction take place which causes the molecules to change shape. The changed molecular structure absorbs portions of the visible light. This causes the lenses to get darkened. Therefore, polarized lenses are quite effective.
The number of the molecules which change shape differs from the intensity of the UV rays. When the photochromic sunglasses are no more exposed to UV rays, the reverse chemical reaction occurs. The sudden absence of UV light results in the snapping back of the molecules to their original shape. This, in turn, results in the loss of their light absorbing properties. In both the direction, the entire process of change in the molecular structure takes place quite quickly. The darkening of the glass is directly proportional to the intensity of the sunlight.
Photochromic Sunglasses: Pros and Cons
The photochromic lenses have both advantages and disadvantages. Their main advantage is that they get darkened like sunglasses on getting exposed to UV rays. They are particularly helpful to the people who ride motorcycle. Many motorcyclists are forced to carry 2-3 pairs of sunglasses or interchangeable lenses kits with clear, charcoal and amber color lenses. With photochromic lenses, they can buy and carry just one pair of sunglasses for all day and even for night as a replacement for night vision goggles. Therefore, the photochromic sunglasses eliminate the need to carry a separate pair of sunglasses for protecting the eyes against the harmful effects of UV rays of the sun. The disadvantage of photochromic sunglasses is that they do not adjust themselves to their darkened form immediately. They take about two minutes to completely change from clear to dark form or vice versa. There is one more disadvantage associated with photochromic sunglasses. It is that they don't get darkened when worn inside a vehicle. This is because, the UV rays are not able to pass through the glass of the vehicle.
As has already been indicated in this present article, photochromic sunglasses are available only on prescription. Therefore, if you wish to have a pair of it for better eye care, fix an appointment with your ophthalmologist. He will provide you with the best photochromic sunglasses, meant only for you!
By Kalpana Kumari
Published: 6/28/2010
The lenses which darken on exposure to ultraviolet (UV) radiation are known as photochromic lenses. In the absence of UV rays, the darkened lenses return to their transparent or clear state. When such lenses are prescribed to a person for usage, they are called photochromic sunglasses. They are also referred to as transitional or photochromatic lenses. The photochromic sunglasses are generally made of glass, polycarbonate, or some other kind of plastic.
The glass version of photochromic lenses was developed by Corning in the 1960s. Plastic versions of this type of lenses is also available. They are commonly meant for commercial usage. Such sunglasses benefit regular users of eye lenses a lot. It prevents them from carrying two or three pairs of eyeglasses while going out. You might be wondering how photochromic sunglasses change their color on getting exposed to UV rays. To learn about this along with some advantages and disadvantages of photochromic sunglasses, keep reading.
Photochromic Sunglasses: An Introduction
The reason behind the ability of the photochromic sunglasses to change their color from light to dark is its molecular structure and the effect of light on it. The polarized photochromic sunglasses contain millions of molecules of substances like silver chloride or silver halide. These molecules are transparent to visible light or in the absence of UV light. When they are exposed to UV rays, a chemical reaction take place which causes the molecules to change shape. The changed molecular structure absorbs portions of the visible light. This causes the lenses to get darkened. Therefore, polarized lenses are quite effective.
The number of the molecules which change shape differs from the intensity of the UV rays. When the photochromic sunglasses are no more exposed to UV rays, the reverse chemical reaction occurs. The sudden absence of UV light results in the snapping back of the molecules to their original shape. This, in turn, results in the loss of their light absorbing properties. In both the direction, the entire process of change in the molecular structure takes place quite quickly. The darkening of the glass is directly proportional to the intensity of the sunlight.
Photochromic Sunglasses: Pros and Cons
The photochromic lenses have both advantages and disadvantages. Their main advantage is that they get darkened like sunglasses on getting exposed to UV rays. They are particularly helpful to the people who ride motorcycle. Many motorcyclists are forced to carry 2-3 pairs of sunglasses or interchangeable lenses kits with clear, charcoal and amber color lenses. With photochromic lenses, they can buy and carry just one pair of sunglasses for all day and even for night as a replacement for night vision goggles. Therefore, the photochromic sunglasses eliminate the need to carry a separate pair of sunglasses for protecting the eyes against the harmful effects of UV rays of the sun. The disadvantage of photochromic sunglasses is that they do not adjust themselves to their darkened form immediately. They take about two minutes to completely change from clear to dark form or vice versa. There is one more disadvantage associated with photochromic sunglasses. It is that they don't get darkened when worn inside a vehicle. This is because, the UV rays are not able to pass through the glass of the vehicle.
As has already been indicated in this present article, photochromic sunglasses are available only on prescription. Therefore, if you wish to have a pair of it for better eye care, fix an appointment with your ophthalmologist. He will provide you with the best photochromic sunglasses, meant only for you!
By Kalpana Kumari
Published: 6/28/2010
Thursday, September 9, 2010
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Saturday, August 28, 2010
Why you should wear sunglasses?
Why you should wear sunglasses?
People love to look their best, when they step out of their home. They wear the best possible clothes; give a lot of thought to colors and designs before buying garments. Often, people buy expensive and designer clothes to look stylish and smart. They accessorize by wearing various items like belts, handbags, jewelry and sunglasses. They feel confident by adding various accessories to their wardrobe.
Sunglasses are an important aspect of almost everyone’s life. People buy and wear sunglasses for a variety of reasons. Some put them on to look smart and cool. Youngsters often wear them to look hip and smart. Some people use them to protect their eyes from sun and dust. It is wise to use sunglasses when venturing out in the sun.
Direct exposure to the sun causes harm to the eyes, and constant squinting creates fine lines on the face. Those who do not use sunglasses, usually suffer from the problem of crow’s feet beside their eyes. They also develop fine lines starting from under the eyes and running to the cheek. So if you wish to protect yourselves from these harmful effects, it is wise to put on your sunglasses and protect yourself from unnecessary harm.
People love to look their best, when they step out of their home. They wear the best possible clothes; give a lot of thought to colors and designs before buying garments. Often, people buy expensive and designer clothes to look stylish and smart. They accessorize by wearing various items like belts, handbags, jewelry and sunglasses. They feel confident by adding various accessories to their wardrobe.
Sunglasses are an important aspect of almost everyone’s life. People buy and wear sunglasses for a variety of reasons. Some put them on to look smart and cool. Youngsters often wear them to look hip and smart. Some people use them to protect their eyes from sun and dust. It is wise to use sunglasses when venturing out in the sun.
Direct exposure to the sun causes harm to the eyes, and constant squinting creates fine lines on the face. Those who do not use sunglasses, usually suffer from the problem of crow’s feet beside their eyes. They also develop fine lines starting from under the eyes and running to the cheek. So if you wish to protect yourselves from these harmful effects, it is wise to put on your sunglasses and protect yourself from unnecessary harm.
Tuesday, August 24, 2010
Ralph Lauren SunGlasses For Men and Womens
Ralph Lauren SunGlasses For Men and Womens
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