SERENGETI Women's Sunglasses plastic frame photochromatic lens Non-Polarized Lens width: 58 millimeters Bridge: 16 millimeters Arm: 140 millimeters Adaptable lenses are the preferred choice by drivers and pilots Photochromic lenses allow the eye to experience enhanced contrast Darkening in bright sunlight and lightening in overcast conditions Serengeti lenses react to UV light by adjusting to the changing light