Glasses with an adjustable focal length -- sounds so simple, somebody
must have already done it, right? Well, yes, but earlier efforts
have looked more like diving goggles than something you could, you know, wear in public. The Harry Potter-esque TruFocals, on the other hand, are (only just) acceptable looking and operate via the golden slider you see above. By tweaking translucent fluids
between a pair of lenses for each eye, it alters the distance at which the specs focus, sort of like having your very own zoom function
. The price for such flexibility is $895, which inventor Stephen Kurtin considers a sterling bargain, and we've got video of him after the break explaining just how awesomely revolutionary his product is.