Today the U.S. Patent and Trademark Office officially granted Apple a patent that relates to optical systems, and, more particularly, to Apple s future smartglasses with tunable lenses. With today s Apple Vision Pro, additional Zeiss prescription lenses could cost users approximately US$600 a pair, according to Bloomberg s Mark Gurman. With Apple s future smartglasses, they ll use an advanced adjustable lens system that, more than likely, not carry an added cost.