So How Do Sunglasses Work?

There are two reasons to wear sunglasses. Thehigh-frequency light waves, which means that the
first reason is if you don't like the bright sunchemical structure has to be built to deflect higher
shining in your eyes, as the dark surface of thefrequency light while allowing through lower
sunglasses helps to block out bright light and makefrequency light. This is difficult science, and the
the world appear darker. The second is that thematerials needed to do it are expensive.
sun's ultraviolet rays can be harmful in the longThe most complicated sunglasses of all are
term, causing all sorts of problems with yourprescription sunglasses. These are sunglasses that
eyes including loss of eyesight and eye cancer.not only protect from light and UV, but also work
Good sunglasses protect against this, as theirlike normal glasses to correct your eyesight. For
lenses filter out most of the harmful UV rays.this to work, it requires that normal
So how do sunglasses work? The darkeningvision-correction glasses are taken, tinted and
effect is a very simple one: looking at the worldcoated with UV-reflecting chemicals - a
through tinted lenses makes it seem darker tocomplicated three-step process. However, all the
you - even though the effect is really just aningredients work together flawlessly, to produce
optical illusion, it can help you if exposure to brightsunglasses that are wearable by people who need
sunlight tends to give you a headache or causetheir vision corrected all the time. It is even
you to squint.possible to buy clear tinted lenses that fit over
The UV-filtering effect, however, is morethe top of your normal glasses, effectively a
complex. UV-filtering lenses are coated withdo-it-yourself way of making prescription
special chemicals that allow light to pass throughsunglasses.
them, but reflect away UV. UV rays are basically