Can judge the merits of the sunglasses from two aspects of quality and aesthetic.
Aesthetic personal factors, the quality is a certain standard.
Sunglasses can cause harm to the human eye to prevent sunlight intense stimulation, and can play a decorative role, in sorching summer are popular with all ages consumers.
Unqualified sunglasses, however, not only don't protection, some bad products will cause harm to the human eye, even so, national industrial products production license management of sunglasses products.
The quality of the sunglasses mainly refers to the quality of the lens.
The world's general standard for the U. S. food and drug inspection bureau (
1 a, according to the FDA standards.
The lens in the protection of light transmittance at the same time, to filter out more than 90% of the ultraviolet ray in sunshine, the lens should be posted 'UV -
100 protction 'label, when 100% filter out ultraviolet light, should be posted' UV -
400 protection 'label, so check the lens on the UV label is quite important.
Lens can't have a 'd' optical lens.
If the diopter of more than 15% commonly, wear will feel dizzy.
Lenses must have high strength and impact resistance test.
In general, plastic (
Or cellulose acetate propionate)
, resin, glass strength from small to large.
Second, according to QB2457 -
1999 'sunglasses' 1.
Surface quality and internal fault, should conform to GB10810 in 5.
The lens of optical properties (
Top coke, prism degrees)
And shall comply with the requirements of GB10810.
Frames, shall comply with the requirements of GB/T14214.
Assembly accuracy and cosmetic requirements, should accord with the requirement of GB13511.
Light transmittance: lens of light transmittance should according to its classification in accordance with indicators.
The average transmittance (
Ultraviolet spectrum area)
: lens ratio should according to its classification in accordance with the average transmission, if the lens is designed as a special uv lens, the 315 nm to 380 nm near ultraviolet area average transmission ratio should be detailed by the manufacturer.
The transmittance characteristic about traffic signal recognition.