I would NEVER use cr39 on a RX over +3.00 or -3.00 unless i HAD TO. It looks like crap, sorry but like pure crap.It will stick out up to. 6.7mm i would consider this to be heavy and ugly.Sorry but just because you want to save money doesnt mean you should buy the cheapest product available. Sorry all lenses have abberations, cr39 in one of the most stable materials in this regard.However, unless you have low vision, or are unable to be corrected to 6/6 with spectacles you are very unlikley to notice the difference in abberations if you go for a high index.
On May 30, 8:52 am, Paul <[email protected]> wrote: > -4.00 is not that bad. Personally, except for rimless, I would stick > with CR39 because of low price, reasonably good thickness, and > excellent optical quality. > > If you're getting plastic frames, CR39 is a complete no-brainer. The > frame will hide any lens thickness, and there's no chance of chromatic > aberration. CR39 is probably not suitable for rimless for other > reasons than thickness. I would think that it's fine also for metal > frames unless you're getting really large ones (50+ mm). > > Zenni's standard 1.57 "Thin and Light" plastic" (probably the same > stuff that other places call by that name) should also work fine with > any frame. --~--~---------~--~----~------------~-------~--~----~ Check us out at the oft-updated http://glassyeyes.blogspot.com! You received this message because you are subscribed to the Google Groups "GlassyEyes" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/glassyeyes?hl=en -~----------~----~----~----~------~----~------~--~---
