Brian wrote: > > I've decided to take the plunge and order glasses online. I'm very > glad I found this site and have been reading everything I can find. > > I have a question: I'm buying a pair of progressives and a second pair > of sunglasses (probably distance only). > > My prescription: > > Left: -5.25 cyl -125x160 ADD +1.5 > Rt: -3.5 cyl -125 x 010 ADD +1.5 > > Should I be looking at a high index (1.67) or would CR-39 work? For > either progressive or simply distance.
They'll both work, but 1.5 index CR-39 makes a _much_ thicker lens than 1.67 index plastic. CR-39 also gives noticeably better quality vision, in my experience. And it doesn't get scratched up quite as easily (but it is still plastic, so you must be gentle with either one). If you like big or wide lenses, use 1.67 index, because the outer edge thickness of your left lens will remain modest. If you favor small, narrow lenses, CR-39 is a good option for its excellent optical qualities. Plastic frames often look OK with relatively thick lenses, while metal frames can accentuate the perceived lens thickness. So your choice of frame materials might influence your choice of lens materials. In either case, get polished edges. That makes a huge difference in how conspicuous the lens edge thickness is. I have used 1.7 index glass lenses a few times, which can't be edge polished. The lenses are thinner than most plastics, but they appear thicker with the frosted edge. Chalo --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
