<p>1. Measure your old pair of glasses to get the dimensions that&nbsp;fit&nbsp;you the best.&nbsp;With these measurements, you can easily compare them to the&nbsp;frames on our website. Please see the photos below for guidance on frame measurements (a 2-3mm difference is acceptable).</p> <p><br /> <br /> <img alt="" src="https://df5apg8r0m634.cloudfront.net/email/2019/1225/ttomel2W9229g0ks.jpg" /><img alt="" src="https://df5apg8r0m634.cloudfront.net/email/2019/1225/F2rKzgUQaU8pg17s.jpg" /> &nbsp; &nbsp;&nbsp;</p> <p>&nbsp; Diagonal length refers to the&nbsp;diagonal measurement of each lens, corner to corner.&nbsp;</p> <p>&nbsp;</p> <p>2. You may also find the dimensions printed on the temple arm of your old glasses.</p> <ul> <li>54 stands for Lens Width, which is the horizontal width (in millimeters) of each lens.</li> <li>18 stands for&nbsp;Bridge Distance, which is the distance (in millimeters) between your two lenses.</li> <li>140 stands for&nbsp;Temple Length, which is the length (in millimeters) from each screw to its temple tip.</li> </ul> &nbsp; <p><img alt="" src="https://df5apg8r0m634.cloudfront.net/email/2019/1225/kGOO4K83HLFJJ41i.jpg" /></p> <p>3. Try on some glasses at a local optical store, note the size that fits you and then find a similar size on our website.<br /> &nbsp;</p> <p>4. We divide our frames into 3 categories: Narrow, Medium and Wide.&nbsp;&nbsp;The size represents the total width of the frame:</p> <p><strong>Narrow:</strong>&nbsp;Total Width&nbsp;&lt;129mm</p> <p><strong>Medium:&nbsp;</strong>&nbsp;Total Width 129mm to 135mm</p> <p><strong>Wide: </strong>Total Width&nbsp;&gt; 135mm<br /> &nbsp;</p> <p>You can use these sizes to filter results when searching for frames on our website.<br /> <br /> <img alt="" src="https://df5apg8r0m634.cloudfront.net/email/2020/0223/LQL53JMEEpxStT9Z.png" /></p>
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Lens Thickness/ Lens Index

What is the difference between single-vision and bifocal/progressive lenses?

How to choose lenses?

Photochromic & Transitions® Lenses Introduction

What coatings and add-ons do you offer for your lenses?

Lens Color

Can I buy lenses only to fit into my old glasses frame?

Do you offer bifocal or progressive lenses?

What're the difference between Tint lens, Photochromic lens and polarized lens?

Difference between Spherical Lens and Aspherical Lens

How to use progressive glasses?

Do the lenses include any coating?

Which kind of lenses are free?

Spherical VS Aspherical Lens (video)

Do you have prism lenses?

Lens Functions

What's the difference between basic coated lenses, standard coated lenses and blue-light blocking lenses?

What is the material of your lens?

What type of bifocal lens do you use?

How to change the lens of safety/sport glasses?