Visual inspection to the sun glasses quality
But unable to distinguish whether the lens can keep out ultraviolet ray, consumer is when the choose and buy sunglasses, visual inspection by the quality of the lens. Should be paid attention to, such as the lens surface is smooth, without scratches and bubbles; The lenses flat, from horizontal direction observation lens whether there is a warp, etc. Gucci GG4276 / S unisex sunglass hawksbill gold J5GCC also sunglasses can be get 30 centimeters away from eyes, through the glasses look around vertical line and horizontal line, such as window frame or door frame, is interested in this glasses from top to bottom and move around, such as found that distort or observation by the straight line in the swing, illustrate the potential deformation of the lens, not to buy the sunglasses. Anta AT8002C1 large black frame sunglasses hipster fashion authentic female polarized sunglasses another approach is to put sunglasses at present, the outward convex lens, slowly moving up and down, from the inside lens observing distant objects. If most of the stationary object, local similar corrugated beating, mirror surface is uneven. On the surface looks uneven or have defects and bubbles of the lens, after wearing can cause discomfort such as dizziness, unfavorable also choose and buy. C01 frame sunglasses factory S9103 sunglasses black/lens gradient grey and dark sunglasses can effectively keep out light, but the transmittance of visible light are low, generally only 10% - 30%; Light color sunglasses, by contrast, although keep out light effect is not obvious, but the transmittance in the visible region of the also is higher, about 40% - 80% ( Colorless glass lens to visible light transmittance of 90% - 99%) 。 Good quality sunglasses, which keep out ultraviolet performance should be the same, the difference is mainly due to color depth is embodied in the visible part, the wearer can feel directly.
related: sun glasses sunglasses