LENS GUIDE
Two shields can look alike across a table and attach to their frames in different places. A replacement lens has to match the edge shape and mounting points. Choosing by lens width or brand alone can leave you with a near match that will not seat securely.
Copy the entire model reference
Photograph the inside of both arms and save a front view of the glasses. Record the model, size and any version name. A manufacturer may sell a standard, small and large edition with similar styling. If the markings have worn off, send the photographs to the maker before ordering.
Match the mounting system
Check whether the lens sits in a full rim, a groove, a drill mount, or a specific clip or release. On a shield, look at the nose cutout and the notches near the temples. Do not remove a lens to investigate unless the manufacturer provides instructions for user replacement. An optician can identify a fixed or prescription installation.
Check what you are buying
A listing may offer a single lens, a pair of lenses or a shield without a nosepiece. Check the included pieces, the tint and the UV specification of the replacement itself. Ask whether installation is included and what happens if a supplied part does not match.
A sensible final comparison is the complete cost of parts and fitting against replacing the glasses. A well-fitting frame that you already like can justify a repair, but a cracked rim or damaged mount changes the calculation. Frame repair options · Care guide.