Today's theme is photochromic lenses that no longer darken. Below you will find an introductory guide to understand how a photochromic lens is built, how and why it reacts to direct sunlight and UV rays, which will help you understand why and when this situation occurs.one.
Photochromic lenses that no longer darken, why?
Why do photochromic lenses no longer darken? As you can imagine, it is very simple the chemical treatment is discharged.
Technology continually advances and allows us to count on numerous advantages, especially with more resistant chemical treatments and increasingly high-performance lenses.
As regards photochromic lenses, there have been many technological advances made in recent years.
Despite the continuous evolutionone in constructionone of photochromic lenses, their functionality is guaranteed for approximately 2 years or 2000 transition changesone light dark. Subsequently, wear will take its course and will cause the lens to be not only slower in transitionone but it will gradually darken less and less.
It can be seen from the color assumed by the lens when not working, when a lens is generally discharged (from transparent or smoked depending on the category) a color tending towards yellow is denoted, and if rimremoving the lens from the frame and placing it in direct light reacts very slowly and less strongly than the glasses you just bought, which means that the time has come to change the lens because it is no longer able to offer maximum protection.one from light and UV rays.
A second test could be to see the reactionone of the part of the lens that does not work when inserted into the frame, you will see that not only will it darken immediately, but it will reach a completely different color from the unloaded lens.
we at DEMON We have all the eyeglass lenses available in collectionsone and discontinued modelsone to guarantee the best assistance service to our customers.
Tips for increasing the life of your lenses
There are some simple tips you can follow to increase the life of the photochromic lens, they are small things that in the long term guarantee a longer duration of the photochromic treatment:
- Conservationsone: Store the lens in a cool, non-humid place inside its case (to prevent contact with light, even artificial light when not in use).
- Cleaning the lens: Clean lenses and glasses only with cold water at the end of each use. Wiping sweat residue off the lens prevents a componecorrosive means to settle and sediment on the surface.
Do not use in zone with high salinity, e.g. sea.
Salinity such as sweat are very corrosive for the lens, in fact there is a risk of compromising the chemical treatment.
- Never leave the glasses at high temperatures, e.g.: car dashboard, not in direct sunlight (even if shielded by window glass. E.g.: shelf at home)
The usefulness of a photochromic lens in sports
Any outdoor sport is practiced on primThe rule to follow is to choose ID filtersonewhich best protect the eyes from light, from possible accidental impacts, from air, dust, insects and all projections that could come into contact with the eyes which drastically reduce the perfect faceone.
Photochromic lenses are truly intelligent lenses
For athletes, using a photochromic lens for outdoor activities means choosing a dynamic lens, which adapts by darkening and lightening to all changes in light and dark.
Take for example a cyclist or runner who uses a photochromic lens, the lens exposed to direct sunlight will initiate a reactionone chemical that causes the lens to darken (it is important to know that the stronger the intensity of light and UV, the greater the reactionone, with benefits in reaction speedone and greater darkness), in zone of shade where direct light is poor or reacts to itone is reversed returning to the initial state.
In sports, the photochromic lens therefore represents the best performing lens because it guarantees perfect facial expressionone at every changeone of light, therefore allows the athlete to concentrate solely on performanceone.
Prosthesisone of the eyes from the sun
You protect herone of the eyes from the sun and UV of the photochromic lens is inferior, equal to or superior to smoked sun lenses?
It's important to know that you protect herone that the photochromic lens offers from light and UV is the same guaranteed by smoked solar lenses, however it should be noted that this degree of protectionone it is established on a scale of values that varies from 0 to 4 called categories.
The photochromic lens will then make a transitionone of 1, 2 or 3 protection categoriesone during the rezione.
The maximum value reached by the transitionone it therefore represents the maximum level of protectionone which can reach the lens in optimal conditions.
In the collectionone DEMON There are different types of photochromic lenses, we summarize below with relevant transitions:
- Photochromic 2-4: Transitione from category 2 to category 4, specific lenses for mountaineering, ski mountaineering and glacier)
- Photochromic Smoke 0-2: Transitione from category 0 (complete transparency) to category 2 (equivalent to a brown lensone) can be used indoors and outdoors.
- Photochromic DCHROM 1-3: Transitione from category 1 (light smoke haze) to category 3 (glass safety with mirrored lenses) for all outdoor sports even in adverse conditionsone of very strong light.
Buildingsone of the photochromic lens
You build itone of a photochromic lens varies based on the materials used: Glass or plastic material.
In constructionone of a photochromic glass lens by adding photochromic substances such as salts and micro-crystals of silver halide and/or silver chloride to the basic mixture.
In sports, the use of lenses made of plastic material, generally polycarbonate, is preferred, because they are safer and more resistant in the event of accidental impacts. They prevent creationone of fragments which could cause even very serious damage to the eye in the event of very strong impacts.
To create the photochromic effect on plastic lenses, organic compounds such as oxazines or naphthopyrans or mixtures of indoline-spironaphtho-xazines are used; these light-sensitive substances change their chemical structure when irradiated with UV.
There are 2 methods to apply the treatment on the lens:
- For diversone: The lens is immersed in a tank of reagent liquid, then dried and treated with materials to guarantee its protection.one lasted.
- Applicationsone of photochromic film: a film of photochromic film is inserted into the last layer, then treated with materials to guarantee its protectionone lasted.
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