What do these numbers mean?
Frame measurements are located on the inside of the temple. The first number in the measurement refers to the lens width, the second number is distance in between the two lenses (a.k.a. bridge width), and the third number is the full length of the temple.
If you have a current pair of glasses and you like the way they fit, you can compare the measurements to a SEE frame you’re eyeing to see if it would fit in a similar fashion.