My prescription is -13 with mild astigmatism, and I've been most satisfied over the years -- optically, not aesthetically -- with small, rounded, lower index lenses without anti-reflective coatings or polished edges. (The small and rounded lens part is critical if you have a strong prescription and are not ordering high-index lenses.)
I recently purchased two pair of -10.5 reading glasses from Zenni, and as an experiment ordered two pair of #4508 frames (in different colors). The lens size on these is 45W X 25H. One pair is the standard 1.57 index lens, without anti-reflective coating; the other is the 1.61 index lens with anti-reflective coating. Maybe it's my imagination, but I think I see better with the 1.57 no coating pair. Note that all Zenni glasses have polished edges. I'm not sure whether you can specifiy not polished. I find that when I'm outside in the sun I seem to get a reflection off the polished edge of a clear lens. Of course, I should be wearing my sunglasses in the sun, so I've never tried getting Zenni to not polish the edge. On Apr 11, 12:28 pm, Chuck Knight <[email protected]> wrote: > Actually, polycarbonate has the worst optical qualities (abbe value) of any > common material, and exhibits greater aberrations than the other options. > > Usually. > > Zenni is renowned for the quality of their optics, so I doubt it's anything > *in* the lens that is creating the problem. It could be the optical > design...different lens manufacturers can design the lens slightly > differently That may account for the problem you're having. > > OR... And, this is only a theory... It could be the polished lens edges. > > You said the other glasses didn't have the edges polished. Could your > problem be, not aberrations, but internal reflections? > > As an experiment, you could mask the edges of the lenses, and see if it > helps. Electrical or masking tape should work easily, and be easily > removable. > > -- Chuck Knight > > > > On Fri, Apr 10, 2009 at 4:39 PM, banana <[email protected]> wrote: > > > Hi, > > I have pretty high myopia left eye -8.75 with -1.00 astigmatism and > > right eye -8.50 with -1.00 astigmatism. > > I cannot afford to buy glasses from an optical store and usually wear > > contact lenses. I am starting to wear glasses more often now as i > > have had numerous minor eye infections thanks to my job. I also enjoy > > the freedom from cleaning contacts and all the hassle. I have ordered > > several times from zenni and have been very pleased with the > > glasses and with their customer service. However i have a big > > problem. The pairs i have ordered from them have a lot of chromatic > > aberration when i look to the side which is really really annoying. I > > have two older pairs of glasses which have very minimal aberrations, > > pretty much unnoticeable, and these glasses were cheap ones i got > > paid for by public healthcare when living in the UK. These glasses i > > believe are made of polycarbonate as they were kids glasses (im a > > smallish 20 year old, like thin face so i was still getting younger > > peoples frames i think, got the pairs when i was 16 and 18). Neither > > of these pairs have anti reflective coatings yet i get on fine with > > them. My newer pair has polished edges which look way nicer > > cosmetically but i find them annoying when wearing them as they > > reflect light. I got anti reflective coatings on the zenni frames. > > One problem i had with zenni was i couldn't really find a frame i > > liked that had lenses of the appropriate width (my usual glasses have > > 45mm width). Also i need frames that are very durable as i am a very > > active person, and am hoping to spend a great deal of time traveling > > and camping and need several good pairs of glasses that can take a lot > > of abuse (frame and lenses ideally) that won't cost me hundreds of > > dollars as i am pretty poor! I cannot figure out why my older pairs > > have no real aberrations yet the zenni ones are real bad. Would > > buying smaller lens sizes make a difference? Also i contacted > > 39dollarglasses about lens etc and i got a one word answer a week > > later (they say 24 hours for an answer) saying recommend high index. > > I personally don't care too much about lens thickness, although it > > might be nice to spend a bit more money for ONE pair of high index. > > But i heard that high index lenses have even worse aberrations and > > distortion than polycarbonate? As you can see i am pretty confused, > > so i'm looking for lens recommendations and advice on small but very > > durable frames. Something plain too! > > Sorry about the very long post! > > Thanks for your help! > > Mike- Hide quoted text - > > - Show quoted text - --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
