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I got new glasses. Why do things look bigger?

Answers:1   |   LastAnswerAt:2011.05  

The Piano Guy 
Asked at 2011.05.10 01:30:09
I'm nearsighted and just got new glasses, made to the exact same prescription as my old ones. I can see properly, but everything looks huge. The only difference is that my old glasses were 1.74 high index and the new ones are 1.5. Could that be the reason? If not, what is?
answer U V  Answered at 2011.05.10 01:30:09
Mango... if your old glasses had RI = 1.74, your Rx must be relatively high.. is that right?

And now you've got RI = 1.5 because you want to save $$, and now your glasses are really REALLY THICK?...

Anyhow, here's the answer:
Image size when viewed through a lens is related to the power... and the FRONT CURVE of the lenses. Now your old ones 1.74 probably had a very flat front curve... whereas your new 1.5 lens will probably have a +4 or +6 front curve, which would tend to magnify the images (relative to your old glasses).

NB. Both pairs of glasses actually minify your world (as your'e nearsighted)... but the coz you're used to the 1.74, the 1.5 minifies less, meaning that it appears to be larger.
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