Many who are legally blind have functional retinas locked behind lenses so clouded they can't see a thing. Doctors can detect this type of ocular defect using a scanning laser opthalmoscope (or SLO), and can even focus an image onto those hidden retinas to allow the blind to see -- temporarily, since a cost of $100,000 and a rather non-portable design means SLO's are only suited for medical offices. We reported back in 2006 on the efforts of MIT's Elizabeth Goldring and colleagues to create a cheaper, portable version, and now a prototype is entering testing. It's comprised of a digital camera (looks like possibly a
