Under the hot sun, girls generally choose the umbrella or sunglasses to shading, for beautiful to love girl, just for the style of the glasses but ignore the quality of the eyes, and do more harm than good.
To know corrugated inferior lenses, this lens Dai Jiu easily produce symptoms such as dizziness, vomiting, more damage to the eyes.
Determine the quality of the lens tips ray-ban RB4221 -
F men sunglasses 6170/55 blue after chosen a style, the most important is to check the lens, because it is good or bad directly affects the quality of the glasses.
Judgment lens quality have a little trick, is to put the lens in front of about a foot away, through the center of a fixed objects, and then gently move up and down.
If it is a flat light, the object should not move, if the object with lenses or twisted, means that the lens is not flat, concave and convex, buy those sunglasses.
Pay special attention to the following: when buying sunglasses sunglasses factory YC9708 C7 general sunglasses black box silver leg/lens first, first to see if the lens has scratches, impurities, bubbles, stripes, check the packing for sunglasses, regular sunglasses should be marked with name, color, diameter, quality levels, production factory name and trademark, the mirror or tags are marked as both uva and uvb rays and ce mark sunglasses can ensure that block uv.
Second, choose and try to wear the sun glasses have the feeling of dizziness, headache.
Now there are some marked degree of myopia sunglasses for sale, but because of pd and other indicators vary from person to person, so if there is no guidance of professional personage, consumer is best not to choose this prescription sunglasses.
Sunglasses factory ms YC9703 sunglasses C3 black/dazzle colour blue in the third, the sun glasses with your hands two horns on the fluorescent lamp, let the mirror reflective article gently rolling, if it is found that mirror the daylight lamp shades appear wavy, distortion, prove that the lens is not flat, the mirror can damage eyesight.
Fourth, the lens should level off, through higher acuity, sun lens material has two kinds of glass and resin, and the best sun glasses polarized lens should be used.
It USES as well as contact lenses and precision made of synthetic resin, synthesized from seven thin slice, the two outside layer is hard wear-resisting layer;
Layer 2 and layer is 6 shatter-proof strengthening layer;
Layer 3, 5 is uv filter layer, the middle layer is polarized filter layer.
Polarized lens can effectively filter out reflected light and harmful uv rays, and have a shatterproof, wear, etc.
Fifth, the colour of the sunglasses in addition to according to your own color, face, dress to match, also should choose according to in and out of place.
Generally is better to dark gray, dark brown, dark brown and black, blue and purple is the worst, because the two lenses will be through more ultraviolet light.
related: sun glasses sunglasses brand