Folks, I was recently reminded that the GCC list is not a discussion
list and your emails are sent to several hundred members.  Please keep
that in mind.

Thanks.

Jim Gross wrote:
<blockquote style="border-left: #5555EE solid 0.2em; margin: 0em; padding-left: 0.85em">Good points, Victor.  If anyone is thinking about wrap arounds with
corrections that include a progressive lens, I'd recommend getting
some advice from one or more opticians before you buy.  I bought a
pair hoping they would be the ultimate outdoor activity sunglasses.
Not so.  Just as Victor noted, too much peripheral distortion.  I
don't need much of a correction anymore because cataracts hit me early
in life (alas, the life of a geologist).  I have silicone implant
lenses in both eyes that take me to near 20-20.  However, I need a
reading correction.  The progressive reading correction in the wrap
around lens design produces quite a bit of distortion.

Jim

On Jan 2, 2010, at 10:16 PM, Victor Rush wrote:

<blockquote style="border-left: #5555EE solid 0.2em; margin: 0em; padding-left: 0.85em">Hi All
I wanted to thank all of you for your advice on prescription
sunglasses for cyclists. Many of you asked me to give a report on
what I found.
My Initial hope was that I could get a great set of wrap around
glasses like those of you who do not have prescriptions or those that
have contact lenses (I can’t wear contacts).  My hopes were dashed
when I found out that the highest prescription values that you can
have for a wrap around is between +3.00 to -6.00 diopters  for
spherical prescription (standard farsighted/myopic vision) and +/-
3.00 diopters for cylindrical (astigmatism).  The standard for wrap
around lenses is about -3.00. The maximum numbers I have given you
are for Spy+ sunglasses. I require prescriptions of >=-7.00 and 2.00
each.
If your prescription is not that significant (<-6.00 and <+/-2.00
your options are excellent.  These options are the following:
1)    Prescription framed glasses and wrap arounds. These tend to be
pretty good but they can have significant distortion with items in
the periphery. The worse your sight and especially your astigmatism
the worse the peripheral distortion.  You will need to make sure that
the framed or wrap around lenses can handle the prescription.  I
recommend that you talk with your O.D. to determine which company
will provide you with the best option.
2)    Prescription Inserts.  Inserts sit between the coated lens
(sunglasses) and your eye. Inserts are the only option for those of
us who have bad vision and cannot handle contacts.  The problem with
Inserts is the thickness of the glasses. You will need to spend the
big bucks for such things as high Index polycarbonate lenses. These
get expensive!  In addition your peripheral vision will be
nonexistent since the lenses will only give you good sight in the
forward direction. Even so the  can be rather annoying.  Prescription
inserts are the only option for those with significant myopia or
astigmatism.
Your choice of brands is a personnel preference.  The following
brands have excellent options for prescription glasses.
1)    Rudy Project
2)    Bolle
3)    Oakley
4)    Spy+ (these have the highest diopter ratings of any I have found)
5)    Smith Optics
Cheers, Victor

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