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GAINX sunglasses designed to help protect the eyes from excessive sunlight. GAINX sunglasses originally invented to reduce distracting glare and allow more comfortable viewing in bright light. GAINX sunglasses consist of a pair of light-filtering lenses and a frame to hold them in place. The vast majority of lenses are made of colorized plastic. However glass is still employed for high quality. There are two key elements to consider regarding sunglasses design fashion and function.