Quality of lens resolution

Judging the pros and cons of sunglasses can be examined from two aspects: quality and aesthetics. Aesthetic with personal factors, quality is a certain standard. The quality of sunglass basically points to the quality of Eyeglasses Online lens. According to F·D·A standard, the lens in the guarantee of transmittance at the same time, to filter out more than 90% of the ultraviolet light in the sun, the lens should be affixed with the “UV-100 PROTCT10N” label, when 100% UV filter, should be affixed with the “UV-400 PROTCT10N” label, so Prescription Glasses Online it is very important to view the UV label on the Discount Glasses lens. Lenses should not have the “degree” of optical Womens Round Glasses lenses. Generally, if the diopter exceeds 15%, there will be a feeling of dizziness when wearing. Lenses must have high strength and pass impact test. Generally speaking, the strength of plastic sheets (propionic acid or cellulose acetate), resin sheets, glass sheets from small to large. Different people, according to different preferences and different uses to choose sunglasses, but the most fundamental is to ensure the safety of the wearer and the basic principle of vision is not damaged.