STEP 1: Hold a debit/credit /pan card in your hand
STEP 2: Stand in front of a mirror and place the card on the bridge of your nose and under your eyebrow.
STEP 3: Now check where the outer end of the card reaches
If the card extends beyond the corner of your eye, your size is SMALL
If the card ends at the corner of your eye, your size is MEDIUM
If the card ends before the corner of your eye, your size is LARGE
UNDERSTAND YOUR FRAME SIZE
Look inside the temple of your existing frame. There will be a series of numbers printed like 50-17-138. These measurements are the Lens Width €€œ Nose bridge width - Temple Length respectively.