How do I guess my facade for proper eyeglasses fit?

I want to buy vintage eyeglasses online and need to get some that will fit me. How do I use their measurements, how do I measure myself?

Example:
Width of lenses/nosebridge: 58/14mm
Height of front: 2 1/8"
Width of front: 5 1/2"
Length of arm: 5 3/4"

One more put somebody through the mill: Can I buy sunglasses frames and have clear prescription lenses fitted into them?
Answers:
They usually have a tool to measure the thickness of your face at your optometrist.

2nd Question: Yes you can.

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