BZ Optics bi-focal sunglasses
picked these up at the RYA Dinghy & Watersports Show earlier this year, where BZ Optics was keenly promoting them to sailors like me, who need quality sunglasses with lenses They are billed as the ‘world’s first bifocal photochromic sunglasses’, which means that their high impact UV-activated lenses transition from clear (Cat 0) in low or no light, to dark (Cat 2) in full sun. The bifocal magnification is moulded