How do i know the size of my glasses that i should order?

natalie:
    how do i know the size of my glasses that i should order? 
natalie:
    how are you
natalie:
    i like a glasses on your web
Linda:
    good, thank you
natalie:
    but i don't know the size of my glasses
natalie:
    how can i know that?
Linda:
    could you give the model number, please
natalie:
    TF 1005 B c.6003
Linda:
    please hold, checking...
Linda:
    this model is available in s.48x16x135
natalie:
    how do i know what is my size
natalie:
    first
Linda:
    the first number is the lens's width, the second is the nose bridge's width and the third is an arm's length in millimeters. To get the full width of the frame you do the following 48*2 + 16 = 112 mm
natalie:
    thank you
Linda:
    also, you should stop by any local retail optical shop and they should be able to help you toget your measurements