The eye refers to the horizontal width of the lens.
The bridge is the distance measured between the two closest points of the lenses.
The temple is the length of the arm from one end to the other.
Using a hair dryer on medium heat, warm the rear third of the frame - two inches away from the arm - for 15 seconds. Do not exceed 25 seconds.
Immediately after heating, hold one arm of the frame with both hands and use your forefinger and thumb to apply pressure to the end of the arm. Bend the end down for a closer fit, in for a tighter fit, and up for a looser fit.
Not perfect yet? Don’t worry! Repeat the steps again - heat then tailor until desired comfort level is achieved.
Place frames upside down - arms facing upward - on a flat surface and allow them to cool for up to five minutes.