It could be bright in the morning and dark by afternoon. Lucky for you, your EG3. 5 goggle switches lenses out quickly, and Electric's EG3. 5 Goggle Replacement Lens comes in a tint for every condition. This spherical lens curves horizontally and vertically to provide optimal peripherals and perhaps the most optically correct lens shape available. The inner lens features a pressure valve that prevents optical distortion at high altitudes, and the lens ventilation promotes proper airflow. Electric treated this lens with anti reflection, anti fog, and anti scratch hard coatings for a long lasting performance.