The Giro Index 2. 0 OTG Goggles let glasses and goggles share space without either one losing. A finely crafted frame carries extra interior volume, and temple cutouts leave room for eyeglass arms, so prescription frames sit comfortably underneath instead of getting pinched or pushed sideways. Increased air volume inside the goggle keeps that extra room from turning into fog, and a VIVID lens with Optics by ZEISS(R) still delivers premium clarity on top of the fit. What Our Gearhead(R) Experts Are Saying:"I wear my prescription glasses every run and these are the first goggles that don't fog up the second I stop moving at the top of a lift line."