Have I been using the wrong prescription all this time?

[Blu]

I ordered a pair of glasses online two years ago using a PD of 57/54
that I got from my old optometrist. I just had an exam at a new
optometrist and asked him to check my PD just to see if he would do
it. It was 65...

[Chuck Knight]

One of those measurements is wrong. There's too much of a discrepancy
to blame on human error or calibration issues.

So, let's start with the obvious question. The new PD is 65...you
didn't make a typo, and mean 56, did you?

With a discrepancy as big as this one, I would expect you to have
blinding headaches and alignment problems if you had used the wrong PD
2 years ago. Consequently, I lean towards the new one being wrong.

An easy way to tell is to hold a ruler up and look in a mirror. One
value or the other will be more believable.

If you want it professionally measured I'd go by any WalMart, CostCo,
or Sears Optical, and ask to be measured...again.

-- Chuck Knight

[Paul]

If the prescription is weak, the PD difference might not cause much of
a problem.

[Blu]

I measured it myself and the 65 PD looks right. The only reason I can
of for the change is that the old PD is a from a really long time ago.
So I guess I just grew bigger and it changed.