52/15/140? I am trying to buy some glasses I need to know... What do these numbers represent on the inside of my glasses?

52/15/140? I am trying to buy some glasses I need to know my pd. are any of these numbers my pd? I already know my perscript number its -4.50 in both eyes. I used a ruler online and measure my eyes myself based on what it said you go from 1 center of the pupil to the other center of the pupil. and I got a 65 give or take a mm.
Answers:   The first set of numbers describe your frame size. Your lenses are 52 mm wide, and there are 15 mm between your lenses. Your temple pieces are 140 mm long. None of those help you get your PD.

The website gives you instructions for determining your PD. While I can't tell if the PD you've measured is correct, the 65 mm is in the typical range.

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