As people age, the ability of their eyes to focus close up declines. When a team led by Penn psychologist and neuroscientist Johannes Burge discovered that monovision, a common treatment to counter ...

Monovision contact lenses, a common prescription, corrects each eye for a different distance, causing one image to be blurrier than the other and prompting some to misjudge the distance of a moving ...

Having a good weekend? Got some sun? Great. Grab some sunglasses and stare at the computer screen. We’ll show you an example of the Pulfrich illusion. The Pulfrich illusion, or Pulfrich effect, was ...

As we age, our eyes lose their ability to focus up close. It's a condition called presbyopia, and it's both extremely common and relatively easy to fix, with solutions like reading glasses, bifocals, ...