Tortoise Shell Frame Grey / Costa 580P Polycarbonate Lens - The best plastic lens available. Hinge Type: Integral. The Costa 580P Polycarbonate lens is Costa's top of the line plastic lens. 580P is shatterproof, repels water and oils, offers exceptional quality, and optical clarity. C-BL10-5-PC-GYA larger, full coverage fit with megol lined frames and zero slippage! .