> Can someone recommend a link to learn to distinguish between the > various lens materials and their characteristics?
Opticampus is a fun site. For a useful summary table I like http://www.opticampus.com/tools/materials.php It might not cover everything and sometimes one needs to divine (fancy word for 'guess') what materials some of the online sites are using or to email them for specifics if needed, but it's a handy table. and for calculating thickness there is http://www.opticampus.com/tools/thickness.php (often mentioned here, sorry if duplicating but it's a handy link). On Nov 3, 8:47 am, clocker <[email protected]> wrote: > Eric that's quite the sobering picture you paint. It serves me well > as a reminder to be grateful for my gifts and not to focus on my > shortcomings. Thanks for your generosity of spirit. > > Can someone recommend a link to learn to distinguish between the > various lens materials and their characteristics? I'm sure once I > become aware of things like chromatic aberration, I'll be irritated by > it. I had no idea such nits could be picked. ;^) > Ian > > On Nov 2, 2:22 pm, "[email protected]" > > <[email protected]> wrote: > > Hi Ian, > > > Thank you for asking your questions! > > > You've said something very important, that deserves the group's > > attention: > > > "What strikes me about this process is that I don't think everyone > > experiences subtlety the same way." > > > How true! > > > We have a very wide range of members, in the quality of our vision, > > the strength and complexity of our prescriptions, and the kinds of > > tasks we perform with our eyes. > > > We need to make a habit of asking these questions, so that our > > discussions are as helpful as possible to a wide variety of people. > > > You, for instance, have excellent vision which permits you to see and > > work with very fine detail. You require a minor correction with superb > > optics to do your work, and enjoy the vision you're blessed with. > > > We have near-sighted members who do things like graphic design. For > > them, the chromatic aberration in polycarbonate lenses would be > > noticeable and annoying, but the rest of us might not even be aware of > > it, most of the time. > > > On the other hand, we have windsurfers who really need polycarbonate > > or Trivex. > > > Myself, I have poor vision, have had surgery for a detached retina, > > and am lucky to be able to see as well as I do. I have an unusual > > prescription, but fine-tuning and super-expensive optics are overkill > > for me. I'm thrilled to be able live a normal life, drive a car, read, > > and use a computer to communicate and buy glasses. I don't need to do > > close work, or pilot an aircraft. > > > These discussions help us understand each other and our needs, as well > > as the technical details. How gratifying it is, to be able to do all > > this without being manipulated and exploited by the optical industry! > > > Eric --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
