It may look like a refugee from a Ray-Ban catalog, but the $2,699 Glasstron PLM-S700 from Sony (800/352-7669, https://www.sony.com ) is actually a head-mounted computer display that places a 0.5-inch LCD in front of each eye. Sony claims that the device creates the illusion of watching a 52-inch monitor from a distance of 6.5 feet. The 3.5-ounce display includes rechargeable lithium-ion batteries and built-in earphones.