Go to your local store, probably WalMart or similar, and be sure to wear
your regular glasses. Then, while wearing your regular glasses, try on the
standard readers by placing them in front of your regular ones.
The value of the reader that works best for you at the desired distance is
the ADD value you need.
-- Chuck Knight
On Sat, Oct 16, 2010 at 7:04 PM, Greg <[email protected]> wrote:
> How do you calculate what sphere additional value to specify if you
> want your monovision glasses to work best at x distance --- e.g., at
> 28" from a computer screen? I've ordered three pairs of glasses to
> use with my computer, and for the last two, I added 0.75 to the SPH
> values of my prescription (which worked well), then 1.00 (which worked
> a little better). It's just been guess work, so far, since I've never
> seen a formula that would give an analytic approximation. At my last
> eye exam, I asked my optometrist what values I should use for my
> computer screen, and she told me to add 1.50 assuming my computer
> screen was 22" away. Maybe that was right, but how do I know? (Just
> going on intuition, I decided 1.50 was too high, and I ordered some
> glasses from Zinni using an add value of 1.00, and those seem to be
> okay.)
>
> --Greg
>
> --
> Check us out at the oft-updated http://glassyeyes.blogspot.com!
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