As for finding the highest index with the best Abbe values, check out this list http://www.opticampus.com/tools/materials.php As you can see, regular cr39 probably has the best Abbe value after crown glass, but with a -7.00 script, your talking some pretty thick lenses (especially at rhe outer rims). Have heard many on here who have high negative scripts suggest getting the smallest lens size you feel comfortable with, because it will cut the weight, and the thickness around the lens edges.
Spectralite seems to be about middle of the road with a index of 1.537 and a Abbe value of 47. Hope this help you somewhat, -=# Firewalker #=- On Mar 13, 9:54 pm, Rob Morton <[email protected]> wrote: > Hi all, > > It's about time to replace my old pair of glasses, and since I'd > rather not waste $400 I see no reason not to shop online instead of at > an overpriced retailer. I'd like to find a retailer that offers nice > lenses, even if they cost a bit more than the cheapest ones out there. > > The lenses I have right now are a moderately strong prescription > (-7.00 last I had them checked) and made polycarbonate with anti- > reflective coating, and are five or six years old now. Honestly, > they're just awful. I'm one of those people who is very sensitive to > chromatic aberration; I guess I look off-axis a lot, and seeing red > and blue outlines on *everything* bothers me. (There's a purple LED on > my computer, and if I look at it out of the corner of my eye, I see > two wholly separate red and blue circles....). So ideally I'd like a > lens material that's got a reasonably high index (better than > polycarbonate at 1.59, anyway) and a good Abbe number (hard to do > worse than polycarbonate at 30). I also want a nice anti-reflective > coating, particularly one that's easier to clean than this old > LensCrafters garbage. > > Is there any retailer out there who describes their lenses in enough > detail to know what their chromatic performance is, or better yet one > that sells lenses that definitely meet my above criteria? > > Thanks for any help, > Rob --~--~---------~--~----~------------~-------~--~----~ Check us out at the oft-updated http://www.glassyeyes.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 -~----------~----~----~----~------~----~------~--~---
