Vision

One symptom of post-traumatic stress disorder (PTSD) is intrusive visual reminders of a traumatic event. New research in Current Biology finds that the brain uses similar visual areas for mental…

Sildenafil (viagra) is used to treat erectile dysfunction and is safe, with known side effects, but a few people have experienced light sensitivity and color vision impairment at the highest…

Since math is a language, there is no reason blind people can't learn it, but math and science textbooks in Braille require an enormous effort to produce. That means much higher cost for a small…

Myopia (nearsightedness) is the most frequent cause of correctable visual impairment worldwide.  It occurs when the eye grows too long from front to back (axial length). Instead of focusing…

In the comics and films, Clark Kent wore reading glasses while Superman had no glasses but sported a lock of hair on his forehead - and no one figured it out. Ridiculous, it was later said. Perhaps…

I woke up from a nap, on my back, looking up through my bedroom window at a brightly lit blue sky and saw them again: numerous small, uniform dots swimming in my field of view. This time I paid…

 If you have seen a face in the clouds or you have been part of a phenomenon called "pareidolia" - a willingness to recognize a non-face object as a human face. Humans sometimes perceive an…

Republican candidate Donald Trump and Democratic nominee Senator Hillary Clinton arguing about the colors to wear this evening -and the winner takes the White House. Clinton: All I have to do is…

In comics, Clark Kent looks a lot like Superman, so similar every child has to wonder why no one puts it together. A pair of glasses on Kent, and a small lock of hair on Superman's forehead, are the…

Octopuses, squid and other cephalopods are colorblind - their eyes see only black and white - but their weirdly shaped pupils may allow them to detect color and mimic the colors of their background,…