1. face shape: Person with wider face should choose a bigger sunglasses; narrow small face person should choose a thin edge frame. Perfect sunglasses could improve your face shape to a certain extent. For fat round face, dark lenses could "tightening" face visual effect. Long face people better wear a sunglasses with wide vertical amplitude and pink or wine red lenses. Heart face better wear a square frame sunglasses, better with sedate brown lens. 2. Complexion: Dark skin should choose brighter color sunglasses; white skin people are nice wearing any color glasses. Tips: if you can vaguely see the pupil in the mirror when wearing sunglasses, then the sunglasses color is appropriate. You can put off sunglasses to the front of the lamp, if the visual become distortion indicating a lens quality problem. 3. sunglasses lens quality : Currently the world's sunglasses common standard is the U.S. Food and Drug Health Inspection Service (FDA) standards: 1. according to FDA, lens should filter out more than 90% of ultraviolet rays, the lens should be affixed to "UV-100PROTCT10N" label when ensure transmittance, when 100% UV filtering should be posted "UV-400PROTCT10N" tag , therefore the UV lens label view is very important. 2. Sunglasses lens should not have a "degree” as optical lenses. Generally, if the diopter is more than 15% you may feel dizziness when wearing. 3. The lens must have a high strength and pass the impact resistance test. Generally, the strength of from low to high is the plastic sheet (or cellulose acetate propionate) , a resin sheet, glass sheet. In spring and autumn, sunglasses better with lighter lenses, dark frame color; in winter, sunglasses frame color can be brilliant, slightly larger frame shape suitable for wind. From english taobao agent: shopitchina.com
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