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Old 05-23-2016, 01:39 PM
350 posts, read 233,500 times
Reputation: 383


As a public service to all those who want to buy their eyeglasses on-line but need the pupillary distance (aka 'pd') here is an fyi.

The machine the optometrist uses to evaluate your new prescription has the pd on the machine. The machine that you look through is called a phoropter alternatively called a refractor. If the optometrist tells you he/she can't provide the pd they are lying. It is right there on the machine. Here's a link:


The pd is displayed to the left of the knob above the nose. In this example, it looks as it is 64. The optometrist must have to adjust this in order for the lenses to work in evaluating the new prescription - this is my assumption.

Most optometrist's do not want to give you your pd since that is moving business away from them if they have their own eyeglass shop. They tell you that your pd will be determined when you choose your glasses.

Guess I am just steamed as this is what has been told to me time and again and today I find out
the pd is sitting there right on their machine. I don't like being lied to and you probably don't either.

Anyway, wish I knew this before I went into my exam, but at least others can use this info
to get their pd! If nothing else, after the exam just look at the machine to see what the
pd is.
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Old 06-04-2016, 08:02 PM
350 posts, read 233,500 times
Reputation: 383
Further clarification.....

The optometrist has to first determine and calibrate your pd on the refractor before he/she can
start adjusting the lenses to determine your new prescription.

I love youtube. Saw a video of of optometrist giving a demo of how to calibrate the refractor for an
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