Designed to fit over your glasses.  Or, just wear them on their own. BluBlocker StarSheild is Z87 Certified (these can be worn as safety glasses) BluBlocker™ high resolution lenses give you a truly unique ownership experience.  They block 100% of UV light and 100% of blue light. As a result, you will not squint on a sunny day at the beach, on a hike, or on the lake.  The crystal clear BluBlocker™ vision is unique to BluBlocker.  This is what the legendary BluBlocker reputation was built on.   Drawstring pouch included.  Measurements: Lens Width 145mm, Bridge Width 17mm, Temple Length 146mm Item# 2355