With a stylish exterior of metallic blue and gray, the device looks like a personal digital assistant but slightly larger. Julius Mendalis, 84, a lawyer for the company that makes Arizona Iced Tea, paid $795 for this gadget, and he loves it, though he is not a man of technology, rarely uses computers and does not surf the Web. It is helping him read again. The Quicklook, an amalgamation of a tiny digital video camera and a four-inch liquid-crystal display screen, acts as an electronic magnifying glass, enlarging the text of a newspaper or a legal brief to an inch...