Tuesday, October 22, 2013

Photo chromatic sunglasses

Photo-Chromatic Sunglasses

The science behind photo-chromatic sunglasses can be a
little difficult to understand, but the first step is to
know what photo-chromatic sunglasses are.

Photo-chromatic sunglasses are prescription sunglasses that
change from clear to shaded sunglasses instantly when
exposed to the sun then back again when inside.

It is a reversible application commonly known as

Photochromism is the reversible transformation of a
chemical species between two forms by the absorption of
radiation where the two forms have different absorption

As previously stated, it is quite difficult to understand
the science behind it. Though they are highly popular, the
science is still slightly unstable and the color changing
lenses found in eyeglasses cant withstand thousands of
hours of outdoor exposure.

The changing speed from clear to shaded lenses is highly
sensitive to the rigidity of the environment around


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