Total width = left side width + left lens width + bridge width + right lens width + right side width

I've just sent out an email to one of the sites that doesn't provide a "total width" measurement on the frames asking them to start providing it.

Until that happens (and with other sites that don't provide it), here is how you can come up with that number with nothing more than a ruler, your monitor, pencil and paper, and some junior-high math.

Here's how it works:

There is a way to get a pretty decent estimation if you can get a decent photo of the front of the frame (in any size) and have the actual lens width measurement. Using a simple equation solving for 'x'.



In the (fabulous) sketch above, 47 is the actual lens width. 22 is the measured width (in mm) on the printed photo, and 4 is the measured width (also in mm) from the outside edge of the lens to the very edge of the frame. Solving for x you get the following (47 x 4)/22 = 8.545454 (or effectively 8.5) for the external width.



Multiply your known lens width by 2, add the known bridge width, and add your solved-for temple width multiplied by 2 and you have a total width.

In this case, (47 * 2) + (8.5 * 2) + 19 = 130mm.

In the meantime, I'll continue to PLEAD with them to save us from this silliness.

Hope this helps.