Good sunglasses must have the basic conditions

Each component of the sunglasses to compare differences between high quality sunglasses and bad sunglasses.
Lenses: believe everyone are had see had flyover stands Shang sold of "Sun mirror", those oakley sunglasses cheap not only on eyes up not to protection role, also will on eyes caused more large of hurt, this is because people of pupil is will according to light strength shrink zoom of, in strong light Xia pupil will automatically narrow, such on reduces has UV of receives surface, and inferior of Sun mirror of lenses usually are is General of colored lenses, not only not has anti-UV features, also will provides more dark of environment, makes pupil not narrow even zoom. So we first need to select the UV function on a lens, lens colors, you need to select according to the light intensity. In addition, many sunglasses have polarized features, polarized lenses are also essential in activities such as driving, fishing items, I own a pair of sunglasses is polarized, carbide layer on the surface, compared with ordinary PC lenses are more wear-resistant and difficult to scratch.
Frame: inferior sunglasses frames are made of cheap plastic or metal as a material, these frames are generally stiff, far less in their toughness, thermal stability, high quality used TR90 sunglasses, materials such as nickel alloys, nickel-silver alloy.
Nasal supporting and mirror feet: quality of Sun mirror often will according to different of style and different wearing who of need design different of nasal supporting and mirror feet, in movement class glasses of nasal supporting and mirror feet parts increased anti-sliding of soft rubber, for adaptation different of nose design can regulation of regulation sexual nasal supporting, and inferior of Sun mirror often is no these humanized of design of.

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