For most glasses, you'll find the size on the inside of the temple. Some people may also refer to this part as the "arm" of the glasses. Frame dimensions are usually shown as three numbers separated by dashes, which reflect the dimensions of different parts of the frame. If you already own a pair of frames that fit you, you can compare sizes to see if one of our frames is right for you.
for example,48▢20-140. These three numbers reflect the measurements of different parts of the frames.
1.Lens width(LE)
This is the horizontal width of each lens, measured at its widest point. Also called eye size, it typically ranges from 40 mm to 60 mm.
2.Bridge width(BD)
This is the distance between your two lenses. In short, the bridge width is the space where your frames fit against your nose. The bridge size ranges from 14 mm to 24 mm.
3.Temple (Arm) Length(TL)
This is the length of the temple from the hinge to the temple tip, including the bended part that sits on your ear. The arm length is typically 120 mm to 150 mm long.
Lens Height
This is the vertical height of your lenses. The measurement for it is taken at the widest point of the lens within the frame. Lens height is especially important when measuring bifocal or progressive lenses.
Essential considerations when choosing frames
It is recommended that you use this formula for preliminary screening of suitable frames.
(Lens width+Bridge width-Pupillary Distance)÷2
The closer the obtained value is to 0, the more suitable it is for you. Try to keep the difference between this value and 0 within 3, so that we can place the center point of the lens in the middle of the glasses frame as much as possible.
For example,The dotted circle is the spectacle lens, and the smallest circle is the center point of the lens.
48▢20-140
PD:68
48+20-68=0÷2=0
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48▢20-140
PD:61
48+20-61=7÷2=3.5
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48▢20-140
PD:58
48+20-58=10÷2=5
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