From: Jeff Thies on
me(a)privacy.net wrote:
> I've had my PD (distance between pupils) measured three
> times at Costco so can order glasses online
>
> Each time it has been one half to one complete mm off.
>
> How important is PD and how accurate must it be?
>
> I'm thinking I should take all three measurement and
> average them and use that.... one for the right side
> and another of the left side. Good idea?

If you are adjusting to your glasses don't worry. Note that near PD
will be different than far, just to give you one more thing to be
troubled by!

Less worry, more be happy!

Jeff