Gee, thank you for the compliment! But, I'm surprised that my posts
have created hesitation...they're intended to have the opposite
effect.
Anyway...reading glasses are easy. You have 4 numbers on your
prescription, for each eye...
SPH, CYL, AXIS, ADD.
SPHere is the distance correction.
CYLinder is the astigmatism correction
AXIS is the twist needed to correct the astigmatism
ADD is the extra help you need for reading
To generate a single-vision reading prescription, you need only sum
the SPH and ADD values, and enter the result into the SPH field.
Leave the CYL and AXIS the same, and leave the ADD blank. And,
subtract 3mm from your PD...unless you have a measured reading PD.
Let's use an example prescription.
SPH: 1.00
CYL: 0.50
AXIS: 75
ADD: +2.00
To convert this, you would sum 1.00 and +2.00 for a total correction
of 3.00, and the resulting prescription would be:
SPH: 3.00
CYL: 0.50
AXIS: 75
ADD: 0.00
Be sure to remember to subtract 3mm from your distance PD, for your
reading glasses.
-- Chuck Knight
On Wed, Jun 10, 2009 at 10:19 AM, Chris Gallucci<[email protected]> wrote:
>
> First, let me say WOW, what a resource! I wish I had known about this
> back when I laid out some large coin for a pair of Oakleys Why 4 w/
> photochromatic single vision lenses. I've spent the last 2 days
> gourging myself on this board and the blog.
>
> On to my issue -- I have a new Rx for progressive lens but the local
> B&Ms are giving me fits about replacing the lenses with new lenses of
> my choosing. So I'm going online.
>
> Chuck Knight's most helpful and informative posts have lead me to
> hesitate ordering progressives online, at least until and I can get a
> more thorough and complete Rx written. So I want to start my online
> ordering experience by getting single vision glasses. Plus all I need
> is single vision for my sunglasses.
>
> So my question is, do I need to do any conversion factor to my Rx for
> single vision? Or do I just drop the "add"?
> Sorry I don't have my Rx handy but my "add" is +1.25 for both eyes.
>
> TIA, ChrisG
>
> >
>
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