lli5040

How to choose sunglasses

As the weather continued to heat up, summer schedule from, the sun radiates heat into the earth sprinkled selfless, strong light stab the eyes narrowed to only half of Pool and a half, "Oh! If there is like a vice sunglasses, but also 'Cool' another shade line. " So fashionable people in a variety of sunglasses to interpret the trend this summer. Then tell us about how we choose to wear sunglasses to prevent eye damage.
Style fashion wear glasses, does bring new look, the effect of finishing touch, but do not overlook another important function of glasses - to protect their eyesight from the sun's ultraviolet and infrared damage people's eyes in the kind of environment, maintain normal visual function.
Here also tell you that not all of the mens sunglasses are suitable for everyone to wear. Not all of the sunglasses can protect the eyes function. So, how to choose according to their own sunglasses it right? Let us first look at the functions and appropriate sunglasses crowd it!
First, sunglasses it is to have the anti-ultraviolet and infrared, as well as to filter light of short wavelength light (eg blue), because these light damage to the eyes bigger. If by these eyes, long light exposure. Suffering from cataracts and macular degeneration, the possibility is high. Also, by the ultraviolet eyes of the strong stimulation, will suffer from a kind of damage to corneal epithelial disease - called the "electric ophthalmia." So wear glasses with these features can effectively protect the eyes.
Second, sunglasses should have "visible" in the transmission. To control the intensity of external light enters the eye, according to the standard production of glasses (usually should be controlled at 15% - 30%). If a pair of glasses, "visible" transmittance greater than 30%, the eyes of "dark adaptation" capability could not be adequately protected. Work long hours under the sun personnel should wear "visible" transmittance of 15% or less, old people wearing "visible" transmission of less than 10% of the sunglasses will affect normal vision. Pilot should wear "visible" transmittance 8%, so as not to affect safety. Glasses of the "visible" in transmittance is not able to distinguish with the naked eye, the light can be accurately detected spectrometer.
Third, different colors Women's Sunglasses, with different eyes color vision disturbance, we try to choose the eye color of color vision disturbances small. Here are several different visual effects color sunglasses.
1. Ink and brown lenses: the general increase in sunlight contrast ratio.
2. Green lenses: reduce "visible light" into the eye level.
3. Grey lenses: to provide the best perception of color perception.
4. Yellow lenses: enhancing contrast in fog, but the feeling of confusion caused by traffic lights.
5. Orange lenses: In the case of low illumination to provide maximum contrast to the eye, and effective filtering blue light.
6. Pink lenses: for indoor environments, such as working under fluorescent lights used, if AR is better.
Fourth, the staff often engage in outdoor sports should wear sunglasses strong impact resistance, such as pc lens (a lens made of fiber materials). Officers operating in the water (the crew) should have anti-reflective film or polarizing Pei Daijia functional sunglasses to reduce glare effects on the eyes. There is also a function with color sunglasses, sunglasses for this frequent out-home and outdoor staff. With the development of technology, now mostly resin lens glasses, this lens has the advantage of lighter, thinner and more effective. Play better protect visual function.
5, glaucoma patients can not wear sunglasses shade of ink (including the color is rather deep and glasses), because glaucoma patients (in particular, angle-closure glaucoma) should be avoided whenever possible in the dark room work, because the pupil will be in the dark environment and dispersed Crystal diaphragm narrow, affecting the normal aqueous circulation, increased intraocular pressure. These determine, glaucoma patients wearing sunglasses, you can have a similar effect darkroom so dilated pupils, may cause eye swelling, discomfort, and even elevation of intraocular pressure. Therefore, patients suffering from glaucoma is best not to wear TradeTang sunglasses.