u003cbru003eTo judge the pros and cons of sunglasses
, one can look at both quality and aesthetics. There are personal factors in aesthetics, and there are certain standards for quality. Sunglasses can prevent the strong irritation of the sun from damaging the eyes, and they can also play a certain decorative role. They are loved by consumers of different ages in the hot summer. However, unqualified sunglasses
not only fail to protect themselves, but some inferior products can even cause damage to human eyes. Therefore, the country implements industrial product production license management for sunglasses. The quality of sunglasses mainly refers to the quality of the lenses. The current universal standard in the world is the U.S. Food and Drug Administration (FDA) standard. 1. According to FDA standards 1. While ensuring the transmittance, the lens should filter out more than 90% of the ultraviolet rays in the sun. The lens should be labeled with 'UV-100PROTCTION'. When 100% of the ultraviolet rays are filtered out, the label should be labeled 'UV- 400PROTECTION' label, so it is very important to check the UV label on the lens. 2. The lens cannot have the 'diopter' that an optical lens has. Generally, if the diopter exceeds 15%, you will feel dizzy when wearing it. 3. The lens must have high strength and pass the impact resistance test. Generally speaking, the strength of plastic sheets (propionic acid or cellulose acetate), resin sheets, and glass sheets ranges from small to large. 2. According to QB2457-1999 'Sunglasses' 1. The surface quality and internal defects should meet the requirements of 5.1.4 in GB10810. 2. The optical performance (vertex power, prism power) of the lens should meet the requirements of GB10810. 3. The frame requirements should meet the requirements of GB/T14214. 4. The assembly accuracy and shaping requirements should meet the requirements of GB13511. 5. Transmission characteristics: (1) Light transmittance: The light transmittance of the lens should meet the index according to its classification. (2) Average transmittance (ultraviolet spectrum region): The average transmittance of the lens should meet the index according to its classification. If the lens is designed as a special anti-ultraviolet lens, the average transmittance value in the near ultraviolet region from 315 nm to 380 nm should be determined by Manufacturer details. (3) The transmission ratio of traffic signal identification.
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