What is cellulose acetate?
Cellulose acetate refers to a thermoplastic resin obtained by esterification with acetic acid as a solvent and acetic anhydride as an acetylating agent under the action o...
To determine whether the surface treatment process of titanium sunglasses frame is proper, you can start from the following aspects:
Observation appearance
Color uniformity: Properly processed fram...
Optometric data
Accurate degree: Go to a professional eye institution or optician for optometry to obtain accurate myopia, farsightedness, astigmatism degree and axial position data. This is the ba...
Uv protection
View the logo: It is preferred to choose sunglasses with a clear UV protection logo, such as “UV400″, which means that the sunglasses can block more than 99% of the ultrav...
There is no direct correlation between the shade of sunglasses and the effectiveness of UV protection.
The anti-ultraviolet effect of sunglasses mainly depends on the material of the lens and the a...
The maintenance of children’s glasses requires attention to cleaning, storage, use, etc.
The following are specific maintenance methods:
Clean lenses
Daily cleaning: Wipe the lenses daily wit...
