The reason you need sunglasses

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There are two reasons to wear sunglasses. The first reason is if you do not like the bright sun shining in your eyes, as the dark surface of the fashion sunglasses helps to block out brilliant light and make the world appear darker. The second is the sun’s ultraviolet rays can be damaging in the long run, causing all sorts of issues with your eyes including loss of vision and eye cancer. Good sun shades protect against this , as their lenses clear out the majority of the damaging UV rays.

So how do sunglasses work? The darkening effect is a very simple one: having a look at the world thru coloured lenses makes it seem darker to you – even though the effect is really merely an optical illusion, it can help you if exposure to bright daylight tends to offer you a headache or lead you to squint.

The UV-filtering effect nonetheless , is more complex. UV-filtering lenses are coated with special chemicals that permit light to pass through them, but reflect away UV. UV rays are largely high-frequency light waves, suggesting that the chemical structure needs to be built to deflect higher frequency light while permitting through lower frequency light. This is complicated science, and the materials wanted to do it are expensive.

The most difficult shades of all are prescription sunglasses. These are shades that not only protect from light and UV, but also work like normal glasses to fix your vision. For this to work, it requires that standard vision-correction glasses are taken, coloured and lined with UV-reflecting chemicals – a difficult three-step process.

Nevertheless all of the ingredients work together perfectly, to supply sun shades that are wearable by people who want their vision corrected all the time. It is even feasible to buy clear colored lenses that fit over the top of your normal glasses, effectively a DIY way of making prescription sunglasses.

Kay Bornham has been fanatic about sunglasses for at least 10 years, and has written many articles about shades, especially carrera shades and bulgari sunglasses.

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Topics: Fashion | Comments Off

Tags: Bvlgari sunglasses, Fashion, sunglasses

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MLA Style Citation:
Bornham, Kay "The reason you need sunglasses." The reason you need sunglasses. 7 Feb. 2012. uberarticles.com. 7 Apr 2012 <http://uberarticles.com/beauty/fashion/the-reason-you-need-sunglasses/>.

APA Style Citation:
Bornham, K (2012, February 7). The reason you need sunglasses. Retrieved April 7, 2012, from http://uberarticles.com/beauty/fashion/the-reason-you-need-sunglasses/

Chicago Style Citation:
Bornham, Kay "The reason you need sunglasses" uberarticles.com. http://uberarticles.com/beauty/fashion/the-reason-you-need-sunglasses/

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