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Modern photochromic lenses tend to be plastic and instead of silver chemicals they contain organic (carbon-based) molecules called naphthopyrans that react to light in a slightly different way: they subtly change their molecular structure when ultraviolet light strikes them. In this altered form, they soak up more ordinary light as it tries to pass by (technically, we say they have a different absorption spectrum), which is what makes the lenses darken. Imagine lots of molecules suddenly darkening inside a clear lens. It's a bit like closing the blinds in front of your window on a sunny day: as the slats turn, they progressively block out more and more light.You might think all of this would take quite a bit of time, but photochromic lenses respond remarkably quickly. About half the darkening happens within the first minute and they're cutting out about 80% of sunlight within 15 minutes.
Well, it is true that some kinds of essential oils are good for dark circles under eyes. Because some plants are riches in some vitamins beneficial to our eyes, such as vitamin A and vitamin C. So, it would be wise for us to put some essential oil on the circles. However, it would be much more effective if you get adequate sleep on the basis of those oils.
There are indeed some people who have different colors in each of their two eyes. Generally speaking, the different colors in the two eyes for each person will not cause vision problem. These people can possess as normal vision as those who have the same color in their two eyes do. The color of eyes is decided by the amount of pingments in the iris of the eyes. It is may be the amounts of pigments in the two eyes pf a person are not equal or the same that leads to two different colored eyes. But if there are any eye disease coming out in the eyes, people should go to the hospital to have an examination in case of a more serious condition.
A good pair of running sunglasses must have high quality to offer good eye protection. So when you go to pick out running sunglasses, make sure they provide 100% UV protection. Besides, polarized running sunglasses are the good choice because they can block the glare while running outdoors. The most important thing that you should pay attention to when choosing running sunglasses is whether they are comfortable to wear. That is to say, the running sunglasses should fits snugly on your nose and your head.
The answer is absolutely YES. When you get pink eye, your eyes appears red or pink, and it may watery, feel itchy, sensitivity to light,or a sticky, yellow discharge in the corner of the eye.Hear those description,you may thought that pink eye is terrible. And wearing contact lenses while sleep can easy cause eye infection, thus to lead pink eyes. So,what can you do to protect yourself from it? The answer is do not wear contact lenses overnight.
I have bought a pair of regular eyeglasses from pearle vision last year. It was about a week i got the eyeglasses. But the eyeglasses seems great. Now, i still wear the glasses. But their customer services told me that the time that need for making eyeglasses is different from different prescription lenses. So, You'd better contact their worker. They will told you how long you need to wait.
It is very bad for the kids to see too much tv or the computer which will cause the short sighted symptom. Yes, the screen is really harmful for the kid's eyes. When you look at the screen at so near distance, your visual nerves will be damaged which will cause the tiredness easily. Thus, you'd better leave some distance between the screen and your eyes.
They wear sunglasses to protect their retinas from the UV light. Thigh at night the bright spot lights could damage their eyes from being in the dark so long. Ultraviolet (UV) light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than X-rays. But the UV light are not all harmful to our body. We can benefit from absorbing certain UV light because UV light can produce vitamin d and aesthetics. UV light also has its medical applications. However, excessiveness UV light is easy to cause skin cancer. And the deepest effect on body is to damage eye sight and eye nerves. UV light is absorbed by molecules known as chromophores, which are present in the eye cells and tissues, which can lead to welderâ€™s flash, cataracts, pterygium and pinguecula formation. Miners always stay in dark and deep places in a long time, if they don't wear special eyeglasses, they'll be blind soon and catch some other eye problems.
No. Chlorine won't damage polarized sunglasses as long as you don't put your polarized sunglasses in chorine water for a long time. I don't think it is necessary to wear polarized sunglasses to the swimming pool. As you go swimming, you only need to wear swimming goggles when swimming. Anyway, you don't have to worry about your polarized sunglasses. They have no problems at all.
In order to prevent the macular degeneration, you could just take the vitamin C and E which own the antioxidant role. The pathological mechanism of macular degeneration is mainly the aging change for the performance of the retinal pigment epithelium cells for the macular area structure. The outside plate film ingests function declines. It is not the digest plate membrane residual in the body retention in the basement of the cells in the blade. The cells are influenced and form a glass membrane. Thus, it leads to macular degeneration. It is mainly happened in the macular area and gets the long-term chronic light damage, choroidal vascular sclerosis, retinal pigment epithelial cell aging problem. If you get the macular degeneration, you'd better go to see the doctor and accept the treatment. At the same time, eating more food with vitamin C and E will be good for you.
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