How do you tell if someone's glasses are converging or diverging lenses?!


Question:

How do you tell if someone's glasses are converging or diverging lenses?

Or, in other words, how can you tell if a pair of glasses is for farsightedness or nearsightedness (respectively)?

http://webphysics.davidson.edu/mjb/phy22...

I came across this page while looking for a picture with google images and was wondering what the answer is?


Answers:

Farsighted (Hyperopic) person has a converging lens= magnify=eyes look bigger

Nearsighted (Myopic) person has a diverging lens=minify= eyes look smaller

In the picture it is really hard to tell... but it appears they are nearsighted. I also looked up John Lennon and sources say that he was myopic/nearsighted. If the eyes look slighty smaller behind the lenses or if you see the side of their face through the lenses and it appears to be inward from where it actually is.... then you know they are wearing diverging lenses for myopia.
People that are farsighted need (+) plus powered prescription lenses that can magnify the eyes.... and nearsighted people need (-) minus powered prescription lenses which can minify the eyes.




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