Carlene Knight's vision was so bad that she couldn't even maneuver around the call center where she works using her cane. "I was bumping into the cubicles and really scaring people that were sitting ...

A few years ago I posted a column about a rather amazing color vision experiment (Click Here to see my original column). I’m now a little closer to recreating this, but I could still use a little help ...

Imagine you are looking at a manhole cover a few paces away on the street. It looks circular, but this is because of some impressive perceptual machinery in your mind. The pattern of light in your eye ...

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