Wearers of ethical drug eyeglasses have in all likelihood note that a series of threenumbersare stamped inside one side of their frame , which is also bring up to as thearmof the eyewear . This is not the manufacturer ’s attempt to leave you with winning lottery numbers , although that would certainly be nice . Nor is it a serial bit or date of manufacturing . So what are those numbers ?
They ’re the dimension of your eyewear as measured in millimeters . Here ’s how it break down .
Usually , the first number is the width of your crystalline lens at their widest point , which can valuate between 40 and 62 mm in size of it . The next number is the bridge sizing , which measures the distance between the lenses and ranges from 14 mm to 24 mm . The last and largest act is the temple duration , which measure out from the skeleton flexible joint to the back tip sitting behind your ear . The temple distance typically lands between 120 mm and 150 mm .
If you see other number , you may have the lens height stamped on the sleeve or possibly the exemplar number of the frame . A public square may also seem in between the numbers .
lens maker assess the right sizedependingon how the physique sits on your face . Ideally , your eyes should be centered in the lens possible action , the nose balancing the frame , and the figure temples comfortable but untroubled enough to keep the eyewear on your head . A well - agree frame of reference is typically slightly wider than your face . big lenses can make your eyes look like they ’re closer together , while narrow lens of the eye can make them seem farther apart . The bridge width is determined by how comfortably the frames sit on your nose .
Does bonk your numbers guarantee a good paroxysm every clip ? Not of necessity . Let ’s say you have glasses that measure 42 millimetre by 20 mm by 140 mm . You have a 2d pair measuring exactly the same size , but one outfit well on your face . The likely reason is a difference of frame style , which can provide a slimly different look or finger even if the numbers match up . Which is why trying on frames is always your best bet .
