# What numbers do I need from my optomitrist . . .

**URL:** <https://boards.straightdope.com/t/what-numbers-do-i-need-from-my-optomitrist/516099>\
**Category:** Factual Questions\
**Created:** [November 2, 2009, 9:11pm UTC](https://boards.straightdope.com/t/what-numbers-do-i-need-from-my-optomitrist/516099 "2009-11-02T21:11:42Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Eonwe](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/eonwe/32/240_2.png) [@Eonwe](https://boards.straightdope.com/u/Eonwe)\
**Post date:** [November 2, 2009, 9:11pm UTC](https://boards.straightdope.com/t/what-numbers-do-i-need-from-my-optomitrist/516099/1 "2009-11-02T21:11:42Z")

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. . . if I’m going to be buying glasses online? I know obviously my prescription, but there are size measurements too, aren’t there?

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**Author:** ![Zsofia](https://avatars.discourse-cdn.com/v4/letter/z/7bcc69/32.png) [@Zsofia](https://boards.straightdope.com/u/Zsofia)\
**Post date:** [November 2, 2009, 9:17pm UTC](https://boards.straightdope.com/t/what-numbers-do-i-need-from-my-optomitrist/516099/2 "2009-11-02T21:17:10Z")

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Yes, you’ll need your pupil distance. My optometrist couldn’t tell me, but the girls in the eyeglasses store attached to his practice did it with no problem - there’s a little gadget. Took five seconds and they didn’t care that I wasn’t buying from them. Love my online glasses, too!

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**Author:** ![Askance](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/askance/32/8281_2.png) [@Askance](https://boards.straightdope.com/u/Askance)\
**Post date:** [November 2, 2009, 11:24pm UTC](https://boards.straightdope.com/t/what-numbers-do-i-need-from-my-optomitrist/516099/3 "2009-11-02T23:24:16Z")

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Have you thought of looking on the online site you wish to use, and see what they ask for? As an example [GlassesOnline Help](http://www.glassesonline.com.au/how_it_works.php)

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**Author:** ![Really\_Not\_All\_That\_Bright](https://avatars.discourse-cdn.com/v4/letter/r/e8c25b/32.png) [@Really\_Not\_All\_That\_Bright](https://boards.straightdope.com/u/Really_Not_All_That_Bright)\
**Post date:** [November 2, 2009, 11:49pm UTC](https://boards.straightdope.com/t/what-numbers-do-i-need-from-my-optomitrist/516099/4 "2009-11-02T23:49:23Z")

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Only pupillary distance. You might want to try on a few pairs to get the correct eyesize and temple length.

The eyesize will be printed on the arm - it’ll be somewhere around 50 - and then there will be an open square, and the temple length, while will be a hundred and something.