Cheap sunglasses have problem ?
Cheap sunglasses are everywhere. They are a popular free gift from companies that want to appear trendy, and they are on sale at every shop anywhere near a beach, as well as anywhere else that people often go in summer (theme parks, for example). But you should be very, very cautious of cheap sunglasses, because even though it feels like they re helping to keep the sun out of your eyes, they can actually do more harm than good.
What are the best sunglasses to buy?
The problem is that cheap sunglasses dont protect against ultraviolet rays, the rays that can cause problems like eye cancer and cataracts. Instead, they fool your eyes into thinking that its dark when its actually not, which causes the pupils of your eyes to widen, letting in far more UV rays than they normally would. This massively increases the amount of damage that the sun can do to your eyes. While you might be happy to use them to keep the sun from dazzling you, if you do it often you may be significantly damaging your health. If you have a pair of cheap sunglasses or your given one for free the best thing to do, all things considered, is to throw them in the bin.
Of course, the opposite of cheap sunglasses isnt necessarily expensive ones. The sunglasses you want are ones that offer 100% protection from UV rays, but these can actually be very reasonably priced and as long as you keep track of where you put them at the end of the summer, they can last you for decades to come, which makes them even better value. You should look for some kind of official certification that the sunglasses have passed tests both for UVA and UVB screening, and buy from a shop that you trust Come4Buy eShop .
Where can I buy decent sunglasses?
Welcome to Come4Buy.eShop . The price is reasonable and the appearance is beautiful. It comes with a glasses case, free shipping, come and buy sunglasses that protect yourself and your family's eyes.
There are two reasons to wear sunglasses. The first reason is if you dont 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 is that the suns ultraviolet rays can be harmful in the long term, causing all sorts of problems with your eyes including loss of eyesight and eye cancer. Good sunglasses protect against this, as their lenses filter out most of the harmful UV rays.
So how do sunglasses work? The darkening effect is a very simple one: looking at the world through tinted lenses makes it seem darker to you even though the effect is really just an optical illusion, it can help you if exposure to bright sunlight tends to give you a headache or cause you to squint.
The UV-filtering effect, however, is more complex. UV-filtering lenses are coated with special chemicals that allow light to pass through them, but reflect away UV. UV rays are basically high-frequency light waves, which means that the chemical structure has to be built to deflect higher frequency light while allowing through lower frequency light. This is difficult science, and the materials needed to do it are expensive.
