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
>
> >
>
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