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Original Lens
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Polycarbonates are known as parts of thermoplastic polymers. These plastics are widely used in chemical industry. There are some of the important features such as they have temperature resistance and posses optical properties. They can also be used in manufacturing of baby bottles and water bottles. These plastics can also be used in lightening lenses to improve the quality of light because of their optical properties. Polycarbonate plastics are used for making lenses because of their durability, transparency and high infraction index. Polycarbonate lenses are thinner than the glass lenses or other conventional lenses and are almost unbreakable.

Polycarbonate in Flashlight Lens

As polycarbonate lenses are unbreakable, they reduce the risk of getting damage and they are light-weighted. This is the reason why they are more expensive than glass and other lenses. The polycarbonate lenses are able to correct poor quality of light and hence are used in flashlights so that the quality of light can be improved. They also have scratch resistance coating, which prevents any distortion in light omitted by LED flashlight and hence give out high beam of light. They can easily be molded and shaped as per the requirements and can be fitted well in the flashlight medium.

Advantages of polycarbonate lenses over glass lenses

There are various advantages of using polycarbonate lenses over glass lenses. Some of them are listed below:

- Polycarbonate lens are ten times more impact resistant than any other plastic lenses and glass lenses.

- Glass lenses can be broken when hit even with slighter force. Polycarbonate lenses are almost unbreakable so the damages are comparatively lesser.

- Polycarbonate lenses have 100 percent UV protection from the sun's harmful rays.

- The lenses made up of polycarbonate plastics are more durable and are scratch resistant.

- These lenses are lighter than the glass lenses.

However, there are some significant disadvantages associated with polycarbonate lenses. This is known as oxidation or discoloration. It is impossible to figure out with naked eyes but these polycarbonate lenses are made up of the materials which expand when exposed to heat or higher temperatures. This can cause debris, dust and UV rays to enter the lenses over a period of time. The oxidation can also lead to fading and the lens can appear foggy and cloudy over a period of time. Due to the deterioration of the lens the quality of light can also be affected and you may not get the same quality which you received in the initial days.

Depending upon the retirements, you can select the best product for you. However, the disadvantages do occur with the passage of time. You can still go and get flashlights which have polycarbonate lenses in order to experience the benefits.

It will always be a wise decision to get the LED flashlight so that you can enjoy the high beam of light with better quality. These products are used by people all over the world. You can choose the right product by shopping around and reviewing these products.

Discover the best source of cheap LED flashlights online. Visit Chinavasion.com today or paste this link into your browser: http://www.chinavasion.com/index.php/cName/security-equipment-led-flashlights/

Contact Lens Manufacturer - A History

This year (i.e., 2008) will be the 500th anniversary of the original conception of the contact lens. Its present form is the result of centuries of imaginative thinking, scientific reasoning and technological advances.

In 1508 Leonardo da Vinci became the first person to conceive of a contact lens. He did not propose this as a way of correcting vision, but as a way of understanding the manner by which the eye is able to preserve the visual clarity of an object as the object moves closer or further within the field of view. Leonardo da Vinci's remarkable brainchild was not feasible at the time because of technological limitations.

The next development was a hypothetical method put forth by astronomer Sir John Herschel in 1827 for grinding and shaping them to match the shape of the surface of an eye.

As part of this methodology, Sir John Herschel suggested that a mold of the eye be taken in order to guarantee that their shape be a precise fit to the shape of the eye. Nonetheless, the technological ability to create a mold of the eye was not present during the first half of the 19th century.

With the invention of anesthesia in 1884, a glassblower by the name of F.A. Muller constructed the first glass contact lens in 1887. However, the first version to correct vision was not created until 1888 by Swiss physician A.E. Fick and French optician Edouard Kalt.

Originally they were made of glass and covered the entire front of the eye. The glass deprived the eye of oxygen putting its long-term health in peril. Furthermore, they were heavy and uncomfortable so that most people were only able to wear them for a few hours.

Plastic was not used within their construction until the 1930s. These plastic forms were lighter and more comfortable than their earlier counterparts, but still covered the entire front of the eye and prevented oxygen from reaching the eye.

In the late 1940s, the American optician Kevin Tuohy manufactured a plastic version that covered only that portion of the eye known as the cornea. Nonetheless, his contribution still did not allow the majority of the eye to receive oxygen. Tuohy's innovation is commonly referred to as a form of hard contact lenses.

Hard lenses continued to improve during the next two decades, but still became uncomfortable to wear for lengthy periods of time. A remedy came from their soft counterparts that were first manufactured in 1971. Soft contact lenses were the result of years of work by the Czechoslovakian chemist Dr. Wichterle who had been experimenting with a type of plastic known as hydroxyethyl methacrylate (HEMA). These soft alternatives are hard when dry, but soft when wet. This makes them more comfortable to wear, but more difficult to apply.

The first gas permeable contact lens was FDA approved in 1979. Like their soft counterparts, gas permeable forms permit oxygen to reach the eye and are comfortable to wear. Unlike their soft counterparts, gas permeable varieties are easier to handle.

The most recent development has been the introduction of silicone hydrogel contact lenses into the European market in 1999 and into the US market in 2001. Silicone hydrogel negate or mitigate a number of health issues associated with the eye such as corneal swelling, neovascularization and progressive increases in myopia.

Contact lens manufacturers and researchers have made large strides in the health and comfort qualities of this optical technology since their introduction during the 1880s. These advances in comfort and health are the victories won by the hard work and creativity of numerous scientists, researchers and innovators.

About the Author

Independent optician's need an experienced and trustworthy contact lens manufacturer to offer quality products to their customers. For a lens manufacturer to work with you as a partner, eye care professionals should visit National Optical Co. online at http://www.nationalopticalco.com/.

How do Kodak z1012 camera lens come off?

I have a Kodak z1012 IS camera and I just bought two new lenses for it and I was just wondering if my original lens screws off? or do I just screw my new lenses on top of my old one??

HELPPP!

You can take it off, but you can't put it back on... You'll need a screwdriver, pliers and a few more tools to do that....

Well... I'm sorry to report, your camera is a fixed lens camera, so it's not possible to take off the lens and put up a different one. Only SLR camera owners have a luxury to switch lenses at their pleasure...

I'm not sure what lenses you bought for your camera, because nobody makes replacement lenses for this model, but I suspect you bought some kind of converters, not lenses. Converters are pieces of glass that are radically different in design and function than lenses. They are usually mounted on top of your fixed lens and provide either reduction or magnification to achieve either wider angle or longer telephoto reach, or to allow for macro photography... But unlike lenses, they are usually fixed optics, so you still rely on your camera lens to zoom (if zooming is possible - some telephoto converters only work at longest zoom) and to focus. You can also lose a stop or two of light when using a converter, and usually built in camera flash don't work well with them, because they get in the way of light.

If that is what you bought, then yes, you screw it on top of your original lens. For some cameras you also need to tell the camera that you use a converter. Not sure about yours. There would be a button or a menu item, so that the camera knows there's something attached to the lens.

LEM.

Next Lightroom to autocorrect lens problems
The next version of Adobe's Lightroom shows that computational photography is moving from nicety to necessity. In this case, it'll fix lenses' optical problems.

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