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2) To wear to try is there a sense of vertigo, headache. Now indicated some degree of myopia sunglasses sold in the market, for the average consumer, had better not choose those sunglasses.
3) Sunglasses in his hand two angles on a fluorescent lamp, mirror reflective smooth scrolling if specular light images appear wavy, distorted, lenses proved uneven, and this mirror will strain your eyes.
4) Lens formation, higher degree, Sun lens materials are glass and resin, and the best sun lenses polarized lenses should be used.
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6) sunglasses apart from the reduction of glare stimulus, making the eyes appear comfortable outside, the main purpose is to prevent UV rays cause damage to eyes, while color lenses with UV protection are two different things, even if the lens is darker, it may not be effective anti-UV, so be sure to select a marked anti-UV lenses. Sunglasses the UV index usually at between 96%-98%.
7) General formal optical shop testing sunglasses ability to resist UV equipment through this inspection, one can see how glasses are in the hands of eye health has to help.
8) Degrees should meet the requirements for flat glass of the lens and optical defects that do not affect vision. Easy identification, sunglasses can be placed in front of, through observation targets in the distance of the lens, such as window frame or door frame, etc, then the glasses up and down to move forward or backward, the goal should not be swinging and wavy deformation. Can watch Cheap Oakleys Radar Sunglasses Discount sunglasses lenses under the fluorescent tubes on the surface of the image, move the sunglasses image appeared in different parts of the lens of the lamp, lamp images without distortion is the best.