How is the width of frames calculated? Mayu August 31, 2018 22:32 Updated Follow Please see below: Small Medium Large Frame width 130 - 134 mm 135 - 139 mm 140 - 145 mm Related articles What is Pupillary Distance (PD) and how can I measure it if it is not provided with my prescription? Do you offer bifocal or progressive lens options? What makes JINS special? Breakdown of Lens Index of Refraction I purchased the Bose JINS glasses, and something happened to them. How can I get help? Comments 0 comments Article is closed for comments.