2 pairs of glasses?

[Diane Siscanaw]

Zenni has sugguested 1 buy 1 reading and 1 distance
pair of glassses instead of progressives. How do I
change my prescription to do this? Should I do this?

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[Chuck]

I did...

On your prescription you should have 4 sets of numbers...sphere,
cylinder, axis, and add. Sphere is the correction you need for
general use, cylinder is how much correction you need for astigmatism,
axis is how much the cylinder should be "twisted" to work for your
eye, and add is how much magnification you need to *add* for reading.

To order reading glasses, you take your basic prescription, say sph
1.0, cyl 1.0, axis 85, and add +0.5. Your reading prescription would
be sph 1.0 + add 0.5 = sph 1.5. It would be sph 1.5, cyl 1.0, and
axis 85.

The one thing they fail to tell you, unless you ask, is that for
reading glasses your PD value will be slightly lower...usually around
3mm less than your "general" PD.

And, usually, for computer glasses you just add half of the ADD value,
instead of the whole thing.

-- Chuck Knight

[undone]

What I tell people to do is this: With your distance glasses on, go to
the drugstore and try on their readers/cheaters on top of your
distance glasses. In essence, you'll be looking through two sets of
glasses. If your ADD is +2.0, then try +2.0 cheaters over your
distance glasses to see if that works best for close-up. Sometimes the
+2.0 is somewhat arbitrarily assigned by the eye doctor, so don't be
afraid to try +2.5 or +1.5 to see if it is better or worse.

Additionally, you can try the same approach to determine your
intermediate vision, or what some would call "computer glasses".
Intermediate vision is your line of sight from 1 to 3 feet out, the
distance for viewing your computer monitor. Normally, you would take
your ADD number and cut it in half for your intermediate vision.
Again, go to the drugstore and try on cheaters over your distance
glasses to find the strength that best suits you. Normally, it is
about half the ADD number (i.e., if your ADD is +2.0 for reading, your
intermediate will be about +1.0)

Once you determine what your reading and/or computer ADD should be, as
Chuck stated, take the ADD number and add it to your sphere number
only (your cylinder and axis numbers stay the same). For example, if
your sphere is -3.0, adding +2.0 would make the revised sphere number
-1.0 for reading glasses, and adding +1.0 should make the revised
sphere number -2.0 for computer glasses.

Hope this makes sense.

Both my husband and I used this approach to determine the best fit for
our prescription computer and reading glasses and have experienced
excellent fits when ordering online glasses. FYI - I just ordered a
pair of monovision glasses from Zenni last week, meaning my right
(dominant) eye's lens was set for distance and my left eye for
intermediate vision (my close up vision is fine). I figure if they can
do Lasik for this, why not try it with prescription glasses?

[Pau...@yahoo.com]

That's what I ended up doing. I was just never happy with
progressives, and I can get 2 pairs of glasses with single vision
lenses for the price of one pair of progressives. In my case, I still
generally read without glasses at all, so I have one pair of glasses
for distance and one pair for computer (+1.75 on my distance
prescription). I would check with your eye doc regarding what should
be added though.

On Feb 23, 3:28 pm, Diane Siscanaw <dsisca...@yahoo.com> wrote:

> Zenni has sugguested 1 buy 1 reading and 1 distance
> pair of glassses instead of progressives. How do I
> change my prescription to do this? Should I do this?
>

>       ___________________________________________________________________________­_________