Eliminate the need to buy two pairs of safety glasses by the Purchase of the Crews Storm Indoor / Outdoor Lens. The lens changes to dark when outside or in bright light, returns to clear in normal conditions. Ideal for employees working in conditions where they may be outside and inside throughout the course of their work day. No squinting when outside because the Lens turns gray, then clear again after the employee returns inside. It's like purchasing two pairs of safety glasses in one. Meets the ANSI Z87+ standard for optical clarity and impact resistance.