After you stop growing (usually in the 20s) your PD does not change, unless
something truly unusual occurs.
Far PD is how far apart your pupils are, when fixated on an object at
"infinity." Your pupils get closer together, the closer you're focused.
Take the extreme...look at the tip of your nose, and you end up cross-eyed.
The distance PD is usually 3mm larger than the near PD. Your distance PD is
65mm, so that would mean that your reading PD should be about 62mm. Yours
is 60mm.
The remaining 2mm could just be a measurement error.
Let me make this suggestion. Since you have doubt, I would suggest that you
go get a current PD measurement. Oftentimes a local dispensary will do it
for you, for free. Many on this list have had good luck asking at WalMart.
-- Chuck Knight
On Mon, May 18, 2009 at 10:34 PM, Ben <[email protected]> wrote:
>
> Hi,
> I am looking to get my first overseas prescription glasses. My details
> are that I am late twenties, and I am shortsighted with astigmatism.
> I have my old prescriptions from my optometrist. I have a Aug 2008
> Near PD of 30 left and right, and my April 2005 prescription gives me
> a far PD of 32.5 left and right.
> I guess my questions are:
> - Can PDs change over time?
> - What is the difference between near and far PD?
> - Which one of these should I put on my order?
> Thanks for any help you can provide!
> Ben
>
> >
>
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