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My glasses
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this post was submitted on 10 Mar 2026
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I assumed he'd estimated it based on how distorted the face appears behind the glasses. I do that all the time.
At this angle it's hard for me to do that, since I usually use the edges of the face to estimate it. negative glasses pull the line inwards, positive outwards. I can reliably tell when someone is wearing fake glasses (0 strength) for example, and probably estimate strength within 30% of the actual value.
If the image was higher res maybe I could estimate this case too. Or this professional optometrist is just a lot better at it than I am.
Strong negative glasses: (Note the faces contours in the glasses appearing well inside the faces contours around the glassed)
Fake glasses:
Positive glasses:
PS: Searching for generic terms yields 100% fake glasses, so I took a specific person I remember having strong glasses for myopia.
Just love it thanks
This is so cool. Thank you for sharing how to do that.
This is a screenshot of a photo, but you can still see the left side offset if you zoom in. The original photo likely has much better quality to see it with.
Just looked in the mirror... Checks out! :)
Thanks for the explanation. And yeah, on the op picture you can't see any of that clearly, so he needs to have serious practice for that statement.
I'm sure Jonathan was able to provide the exact prescription at a glance.