There are 2 reasons to wear sunglasses (Danish: solbriller). The first reason is if you do not like the bright sun shining in your eyes, as the dark surface of the sunglasses helps to block out bright light and make the world appear darker. The second's that the sun’s ultraviolet rays can be harmful over the long run, causing all sorts of Problems with your eyes including loss of vision and eye cancer.
Good sunglasses protect against this , as their lenses filter almost all of the dangerous UV rays.
So how do sunglasses work?
The darkening effect is a very simple one: taking a look at the world through colored lenses makes it seem darker to you – although the effect is actually just an optical illusion, it can often help you if exposure to bright daylight tends to offer you a headache or cause you to squint.
The UV-filtering effect , however , is more complicated. UV-filtering lenses are covered with special chemicals that allow light to pass through them, but reflect away UV. UV rays are essentially high-frequency light waves, which means that the chemical structure must be built to disperse higher frequency light while permitting through lower frequency light. This is hard science, and the materials needed to do it are expensive.
The most complex sunglasses of all are prescription sunglasses. These are sunglasses that not only protect from light and UV, but also work like ordinary glasses to fix your visual acuity. For this to work, it requires that normal vision-correction glasses are taken, colored and covered with UV-reflecting chemicals – a complicated three-step process. However , all of the ingredients work together flawlessly, to produce sunglasses that are wearable by folk who need their vision corrected all of the time. It is actually possible to buy clear colored lenses that fit ott of your normal glasses, effectively a DIY way of making prescription sunglasses.
Jesper Kayham has been writing about fashion, sunglasses and glasses for more than 10 years. To get a little more information on Tom Ford Sunglasses (Danish: tom ford solbriller) and Carrera Sunglasses (Danish: carrera solbriller) please visit our site.