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...
In summer, the sun is hot and sweat is frequent, and for people who wear frame glasses, choosing a suitable glass material is crucial. So, in the hot summer, what material frame glasses are most su...
What is the difference between resin lens and pc lens, which is good?
Resin lens and PC lens as the two mainstream materials of modern eyeglass lenses, each has its own unique characteristics and a...
Optical glasses can alleviate visual fatigue to a certain extent, the following is a specific analysis from the perspective of different types of optical glasses:
Corrective optical glasses
Princip...
There is no fixed standard for the replacement time of children’s glasses, and it is necessary to comprehensively judge the changes in the child’s vision, the degree of wear of the glas...
Feel with the eye
Clarity: After wearing glasses, under the normal eye distance, such as looking at an eye chart at 5 meters or a book or computer screen at 30-40 centimeters, you should be able to...
