Sea urchins do not have eyes, yet appear to be able to see where they are going. One posible answer: they may use the entire surface of their bodies as a compound eye.
posted by Artw on Feb 7, 2010 - 31 comments

Hacking the Senses: The brain is far more plastic than we commonly realize. Presenting new 'senses' via the old inputs works extremely well, to the point that long-term volunteers are a little lost without their new abilities to feel magnetic north or absolute orientation. Tasting direction; feeling pictures. Fascinating stuff. In a loosely related article, genetically modified mice are able to see the full color range visible to humans, even though the last natural mouse able to see this way died out a hundred million years ago. Add the new sensors, and the brain reconfigures. [via]
posted by Malor on Apr 5, 2007 - 68 comments

27-year-old professional recorder player can not only see colours when hearing music but can taste musical notes (see chart for details). More on synaesthesia, which has appeared here, here and here. [courtesy of CBC]
posted by boost ventilator on Mar 3, 2005 - 36 comments

Surgical Eyes - source of info about complications and their treatment from Lasik and other vision correction surgeries.
posted by Gyan on Jan 31, 2005 - 35 comments

Dr Hugo's Museum of the Mind - Synaesthesia
posted by Gyan on Jan 20, 2005 - 22 comments

Polarization.com - polarized light in nature & technology. [via MoFi]
posted by Gyan on Dec 8, 2004 - 3 comments

Seeing with sound.
A researcher in the Netherlands has developed a system that converts pictures from a head-mounted camera into highly complex soundscapes, which are then piped to the user via headphones. After only a week of use, a woman who has been blind from birth can tell a CD from a floppy, and discern whether the lights are on or off. Not quite up to either a bat and/or Daredevil standards, but very cool nonetheless.
posted by Irontom on Oct 14, 2003 - 5 comments

Cool eyeball science Quick summary of interesting research on the output of the eyeball. 3 really cool things: 1, we know much more about the output of the eyeball now than a few years ago; 2, they've got a neural network doing visual processing like the eye; 3, most of what you see your brain makes up!
posted by daver on Mar 28, 2001 - 8 comments