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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.
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What are transition lenses and how do they work to darken in the sun?
Transition lenses are a type of eyeglass lenses that automatically darken when exposed to sunlight. They contain special photochromic molecules that react to UV light, causing the lenses to darken. When the UV light diminishes, such as when indoors, the lenses gradually return to their clear state. This allows the lenses to provide both vision correction and sun protection without the need to switch between regular glasses and sunglasses.
How do transition lenses work to darken in the sun and lighten indoors?
Transition lenses contain photochromic molecules that react to UV light. When exposed to sunlight, these molecules darken to protect the eyes from harmful UV rays. Indoors, where UV light is minimal, the molecules return to their clear state, allowing the lenses to lighten.
What are the benefits of glasses that darken in the sun?
Transition lenses, also known as photochromic lenses, offer the benefit of automatically adjusting to the level of sunlight, providing both clear vision indoors and UV protection outdoors. This feature eliminates the need to switch between regular glasses and sunglasses, making them convenient and versatile for varying light conditions.
Is rhodium a transition metal or a alkali?
Transition metal
What are lenses with thick centers and thin edges called?
Lenses with thick centers and thin edges are called convex lenses. They converge light rays towards a focal point, which allows them to focus light and produce real images.
Is it possible to change clear lenses to transitional lenses?
No, clear lenses cannot be changed to transition lenses. Transition lenses have a special treatment that reacts to UV light to darken in sunlight, which cannot be added to regular clear lenses. You would need to purchase new transition lenses to have this feature.
Is there sunglasses that you can also see with?
Yes, there are sunglasses available with lenses that can transition from dark to clear when exposed to sunlight. These lenses are called photochromic or transition lenses, allowing you to wear your sunglasses indoors or at night as they adjust in darkness.
Can you swim with transition lenses?
Yes, you can swim with transition lenses. However, prolonged exposure to chlorine or saltwater can damage the lenses over time. It's recommended to rinse the glasses with fresh water after swimming to help preserve the lenses.
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.
What are transition lenses and how do they work to darken in the sun?
Transition lenses are a type of eyeglass lenses that automatically darken when exposed to sunlight. They contain special photochromic molecules that react to UV light, causing the lenses to darken. When the UV light diminishes, such as when indoors, the lenses gradually return to their clear state. This allows the lenses to provide both vision correction and sun protection without the need to switch between regular glasses and sunglasses.
How do transition lenses work to darken in the sun and lighten indoors?
Transition lenses contain photochromic molecules that react to UV light. When exposed to sunlight, these molecules darken to protect the eyes from harmful UV rays. Indoors, where UV light is minimal, the molecules return to their clear state, allowing the lenses to lighten.
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 transition lens work?
Transition lenses contain photochromic molecules that darken when exposed to UV light, and become lighter when the UV light diminishes. This allows the lenses to automatically adjust to different lighting conditions, providing both clear vision indoors and UV protection outdoors.
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.
How do self-tinting glasses work?
Self-tinting glasses, also known as photochromic lenses, contain photochromic molecules that respond to UV light. When exposed to UV radiation, the molecules in the lenses undergo a chemical process that causes them to darken, providing protection from sunlight. Once the UV light is removed, the lenses gradually return to their clear state.
