(Summary description)1. AC lens: low cost, brittle material, brittle chips may be cracked, and general optical index stability;
2. PC lens: The cost is a little higher than that of AC. It is a safety lens called "bullet-proof glass". In fact, there will be no brittle chips and cracks, and the optical index stability is also general;
3. CR39 lens: the cost is higher than the previous two, the optical index is stable, and the clarity is better;
4. Glass lens: high definition, excellent optical index, strong abrasion resistance, heavier weight, easy to be brittle;
5. Nylon lens: clarity is second only to glass lens, and other optical indicators are excellent.

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• Time of issue:2020-11-13
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