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http://en.wikipedia.org/wiki/Photochromic_lens
hotochromic lenses are lenses that darken on exposure to UV radiation. Once the UV is removed (for example by walking indoors), the lenses will gradually return to their clear state. Photochromic lenses may be made of either glass or plastic. The glass version of this type of lenses was first developed by Corning in the 1960s. More recently, plastic versions of these lenses have been commercialized. The first of these was the Photolite lens sold in the early 1980s by American Optical Corporation. The first commercially successful plastic photochromic lens was introduced by Transitions Optical in 1991.[1] The glass version of these lenses achieve their photochromic properties through the embedding of microcrystalline silver halides (usually silver chloride), or molecules in a glass substrate. Plastic photochromic lenses rely on organic photochromic molecules (for example oxazines and naphthopyrans) to achieve the reversible darkening effect. The reason these lenses darken in sunlight but not indoors under artificial light, is that room light does not contain the UV (short wavelength light) found in sunlight. Automobile windows also block UV so these lenses would darken less in a car. Lenses that darken in response to visible (rather than UV) light would avoid these issues, but they are not feasible for most applications. In order to respond to visible light, it is necessary to absorb it, thus the glass could not be made to be clear in its low-light state.
Wiki User
∙ 15y ago
Wiki User
∙ 13y agotransition=to change from one thing to another
the lenses transition to sunglasses once contacted with sunlight causing it to change
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Is fecl3 acidic salt?
Yes. Fe is a transition metal which makes this solution acidic
Is rhodium a transition metal or a alkali?
Transition metal
What are lenses with thick centers and thin edges called?
Convex lenses
What is glass transition?
The glass transition is a second order phase transition. For materials that have a glass transition temperature, below it they are hard and brittle and above it they are softer and "rubbery".
What are warrior transition units?
What are warrior transition units
Can you swim with transition lenses?
Yes, it wont harm them
Where can you buy transition lenses for the Oakley flak jacket?
walleva.com
How do photochromatic lenses work?
Photochromatic lenses are commonly called transition lenses. The lens is clear, but when exposed to the sun's UV rays, they will darken like sunglasses.
How much are transition lenses?
The price of transitions lenses will depend both where one buys them and exactly what type of transitions lens. Most of the time transitions lenses cost between $25 and $50 though can be as high as $100.
Who makes clear comfort contact lenses?
Sauflon Pharmaceuticals makes Clear Comfort contact lenses. They also provide many other types of contact lenses, and a variety of other eye care items.
How do self-tinting glasses work?
Transition lenses that are created using Chromea7 technology are available in grey, brown, and green. If you wear prescription eyeglasses and choose not to wear any type of sunglasses because you do not want to swap your eyeglasses for sunglasses every time you walk outside, we suggest that you wear transition safety glasses. We think you will find many advantages in the polycarbonate material because it is the safest material that you will find in glasses. However, we understand that you may be hesitant to purchase transition lenses in safety glasses. The technology that is being used in transition lenses continues to improve. The transition lenses are now being created using lens material that is so lightweight that they can easily adjust to any lighting condition faster than you can walk outside, walk through the parking lot, and get into your car. The transition lenses can become dark or light to the smallest change in whatever environment you are in. You will not have to worry about your lenses being too light or too dark for the type of environment you are in.
What is refraction in photography?
In Photography, refraction has the same rules as in physics. Well, photography is all about engineering and physics. Refraction encompasses the situation where light goes through a semi transparent object and the photons are slightly drifted from its normal course because the surface they hit separates them. You can see this effect inside a pool or when you look at your own reflection at a cracked mirror.
Which bifocal lenses provide the smoothest transition from close-up view to far view?
try RGP bifocul lenses as a starting point but please check with an optomotrist becauses they can tell you which one is the best.
What concaave lenses and convex lenses make things look smaller?
Convex lens makes things look bigger and concave lens makes things look smaller!
Who makes promaster camera lenses?
Tamron makes many of them. Tamron makes the 17-55 2.8 for example.
What makes eyeglass lenses crack within a week?
dropping them.
What element makes polishes camera lenses?
torilla
