1) to observe the lens scratches, impurities, bubbles, stripes, check the packaging of sunglasses, regular Fake oakleys frogskins sunglasses cheap for sale sunglasses should be marked with name, color, diameter, quality level, the production company name and trademark, mirror or tag on the specify anti-UVA, UVB and CE mark sunglasses blocks some ultraviolet rays can be ensured.
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.
5) Sunglasses color addition according to their skin color, face shape, wear to go with, but should also be based on access to sites to choose from. In General, black, Brown, grey filter worked well; grey lenses to any GC can balance absorption, put them on after seeing the scene darkens without visible chromatic aberration; tinted lenses filter out a lot of Blu-ray, and Fake oakleys frogskins sunglasses cheap for sale can improve contrast and clarity of vision, in case of serious air pollution or foggy wearing the best effects.
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 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.