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Sunglasses are available in thousands
of different shapes, styles, materials, and colors.
You can purchase sunglasses without a prescription from drug stores,
supermarkets, discounts stores, and fine department stores. Sunglasses
are available in thousands of different shapes, styles, materials, and
colors. They are dark glasses, which offer protection form the UV rays
of the sun. However, it is important to know that it is possible to
purchase dark lenses that offer little or no protection from the
ultraviolet rays. Dark glasses that do not protect the eyes against UV
rays
can actually harm the eyes. Dark glasses induce the pupil to dilate,
thus permitting more harmful rays to enter. Your prescription lenses can
be used to create prescription sunglasses. Prescription
sunglasses can use photosensitive lenses, also referred to as transition
lenses. These special lenses grow darker in the presence of UV light.
Unfortunately, there are several disadvantages with transition lenses.
The windshields of many cars protect against UV light, thus inhibiting
may transition lenses from getting dark enough for the driver. On the
other hand, for individuals who work in under fluorescence lighting such
as in offices complain that their transition lenses darken.
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