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Neptune 24 Photochromic Motorcycle Sunglasses Global Vision Black Frame Almost Clear to Smoked Lenses. Neptune 24 has the new 24 hour lens® that can be worn day or night. It's a transitional lens that goes from light to dark automatically (to eliminate the need to change lenses). Plus, it's new photochromic lens technology gives Neptune 24's shatterproof polycarbonate lens a darker appearance than most other polycarbonate glasses on the market.