Optician Q&A

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How to: Measure eyeglasses?

Answer:

Measuring your eyeglasses can be a bit confusing, so let us explain how to do it in an easy way.

 

There are five frame dimensions:

 

• The frame width: this is the distance between both hinges of your frame

• You should measure horizontally across the entire front of the frame. Include any hinge pieces that stick out on the sides.

 

• The lens height: this is the vertical height of the lens

• Measure the lens vertically, at its tallest point. For bifocal or progressive prescriptions, the lens height must be at least 30 mm.

 

• The bridge: this is the part that connects both lenses and sits on your nose

• Measure horizontally, at the top of the bridge, from the edge of one lens to the other.
 

• The temple arms: these are the two ‘arms’ that let your glasses sit behind your ear

• Measure from the hinge—where the arm connects at the front— to the spot where the arm begins to bend down around the ear. Then measure from the top of the bend to the bottom tip. Add the two sections together for the total temple arm length.

 

• The lens width: this is the horizontal diameter of the lens, also referred to as ‘eye size’

• Measure the lens horizontally, at its widest point. Make sure the lens width accommodates your pupillary distance so that your eyes align with the “optical center” of the lens.

 

If you already have a pair of eyeglasses, you’re ahead of the game: there might be a series of numbers printed on the arm of your frame. The numbers can look like this:

55x1x145

 

The numbers indicate the following: 

 

55 mm lens width

16 mm bridge width

145 mm temple arm length

 
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