2 ms·
Among non-glass options, CR-39 is a good choice for computer glasses with prescriptions weaker than -5: - high (58) Abbe number - thick (1.5 index) - che
by walterbell 2y ago
Among non-glass options, CR-39 is a good choice for computer glasses with prescriptions weaker than -5:
- high (58) Abbe number
- thick (1.5 index)
- cheapest
Thickness and weight can be mitigated with a smaller frame, e.g. vintage options.
Actually buying CR-39 lens might require solving a dark pattern maze of online or offline options, since the cost is so low.
- fy20 2y agohttps://www.selectspecs.com/ https://www.selectspecs.com/ if you are in Europe. I've been using them for years.
- AceyMan 2y agoMy indoor (non Transitions™) multifocus² glasses are CR-39¹. I'd used the same material for my outdoor/sports/driving frames but it's higher density caused them to slide down my nose during activity so the next pair I opted for Trivex. -- ¹–CR-39 requires full frame spectacles, as drilling holes is verboten. ²–Shamir Autograph III, awesome & highly recommended.