Take an 80 dollar pair of adjustable focus glasses, http://www.ebay.com/itm/ADLENS-HEMI...ame-Gray-/310892439221?_trksid=p2054897.l4275 and use range finding hardware from a camera, add micro servos to control focus, add a computer to run it all, enable voice commands like, "hold focus"? The glasses would be for someone like me with fixed focus eyes. Assume we could sell a million a year at some price point assuming they did not look too stupid. What might be an approximate cost to produce such a gizmo? Could it be done for about a $100? With good eyes no one would need such a device. Thanks for any help!