Just like shoes, even glasses have different sizes but I feel most people don’t know how to read them

Step 1: find where is the size written on your glasses.

It is usually on the inside of you temples.

That’s the number on my glasses: 9Y12 50•16–138(yours will be similar)

Step 2: start reading from right to left.
The first number is-138.
Which means that my temples are 138 mm long or 13.8 cm.

The next number is-16.
That means the the bridges are 16 mm or 1.6 cm long.

The last number is-50
This means that my lenses are 50mm or 5cm long.

That’s it!
Next time you go to buy glasses you don’t have to try thousands of different frames to see which ones fit!

I hope you have learnt something new.

Thank you.

(pictures are from my mom’s phone cause my phone's camera quality sucks!)

Source: Quora