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The basic idea behind the Photo chromic lenses
These lenses can produce a tint effect depending upon the amount of UV rays falling on them. The tint effect is more on a bright sunny day as the UV rays present are more and less on a dull day as the UV rays present is much less. They do more than ordinary clear lenses as they adjust automatically to changing light thus controlling the light falling on eyes and hence allow the wearer to see comfortably in any intensity of light. They will act as clear lenses when you are inside or when it is night but when you are in sun light they will turn as dark as sunglasses.
There are various names given to these Photo chromic lenses such as Transitions, Reactolite, Reactions and Graduations. But in totality these lenses are known as photo chromic lenses. The photo chromic lenses from Transition are the most advanced lenses and in most cases the Transitions lens is the preferred option due to their over all comfort and performance.
Transition lenses are available in various forms such as in Standard Plastic, Poly Carbonate etc. These lenses are made from very advanced technology and are the very fast to react to the UV rays of the sun. They take not more than 30 seconds to react and it is within this short span of time that they even get clear. Reactolite is another brand name of glass photo chromic lenses. But these lenses take a longer time than the transition lenses to react and are much heavier.
At www.spec2vision.co.uk you get transition lenses in Standard Plastic and Poly Carbonate and can also be fitted in any lens design.
Why transition lenses ?
They help protect eyes like sun block protects skin by blocking 100% of the sun's harmful UVA and UVB rays which can cause cataracts and macular degeneration.
They automatically adjust to block glare, improve contrast and help reduce eyestrain and fatigue.
They are Convenient and fashionable too: Available in brown and grey tints and work with virtually all prescriptions, lens design and materials.
They are ideal in the sense that they can save you having to purchase two pairs of glasses that is, a pair of Clear glasses and a pair of Sunglasses.
They take not more than 30 seconds to react and it is within this short span of time that they even get clear.
Who can benefit by wearing transition lenses?
For anyone who has ever experienced eye strain and fatigue or found themselves squinting in outdoor light, transition lenses are an ideal option. Transition lenses help to make it easier for virtually anyone to see better and more comfortably in any light while enjoying protection for long-term eye health - all automatically and all with the convenience of one lens. Ideal candidates for these lenses are:
The elderly - frequent move from indoors to outdoors-as you work and pursue recreational activities-led to compromise of vision, eye strain and fatigue or the worries of eyesight being damaged by UV exposure. Transition lenses is the most convenient way to optimize vision performance and increase visual comfort while also ensuring automatic, everyday protection from harmful UV rays for anyone who wears prescription eyeglasses by reducing glare and blocking 100% of UVA and UVB rays,
Children - children have greater need for such lenses than adults do as their young eyes are more sensitive to bright sunlight. Because kids spend more time outdoors and also their eyes are not fully developed, the average child receives three times the annual UV exposure as an adult does. Transitions lenses are as clear as regular clear lenses, making it easy for kids to function in class or do their homework. Outdoors, these lenses automatically adjust their tint to minimize glare, making it easier for kids to see better while significantly reducing the discomfort of squinting, eye strain and eye fatigue.
Children also require a safe, shatter-resistant lens material. Transitions lenses are available in sturdy, lightweight, shatter-and impact-resistant materials in the industry's widest selection of lens designs and brand names.
Individuals with certain medical conditions
Individuals who have developed cataracts or other eye conditions
Individuals who have undergone recent eye surgery
Individuals taking certain medication that has ocular side effects.
Individuals with high sensitivity to light, and more susceptibility to invisible UV rays and visible glare.