Sunglasses quality problem
Sunglasses in addition to can reduce the radiation intensity of visible light, can also reduce the ultraviolet and infrared radiation. Polarized sunglasses can also be used to eliminate the water, snow, reflecting the gravel road surface level. Sunglasses today more endowed with fashionable breath. But the fundamental role of sunglasses is to provide radiation protection for the eyes. On the basic requirement of sunglasses are: eliminate unwanted radiation may have damage to the eyes; Reduce the environment light intensity into eyes, provide clear, comfortable functional vision; Can maintain normal color vision, reflected in the rapid and accurate identification of traffic lights; To maintain the amount depending on the night of dark adaptation or; Shock resistance and good wear resistance performance. Sunglasses quality problems are introduced in this paper. Sunglasses quality problems in addition to the sunglasses in the domestic market the main quality problems, such as: the average transmittance ( Ultraviolet spectrum area) Limit; Products labeled ultraviolet prevention performance of the 'wrong'; Poor light transmission performance thereof, popular gradient gradient sunglasses on the market at present, usually upper lens color deep, shallow bottom color. Gradient lenses that are composed of dynamic dyeing, due to the consistency are harder to control in the production of each batch of color and gradient between differences than the single colored lenses, if sunglasses factory ignore this aspect of control, extremely easy to make the product around the eye color and transmittance, in addition to affect beautiful also will increase around the different adjustment of the eye, serious when produce visual fatigue. Next we introduce sunglasses detection index.