Researchers in Bonn reveal how subtle eye movements and the density of photoreceptors contribute to sharp vision. Our ability to see begins with the light-sensitive photoreceptor cells in our eyes. A ...

In adults, health effects from screens are annoying but temporary. Here's what happens when the display is on your face.

You're not feeling well. You've had a pounding headache all week, dizzy spells and have vomited up your past few meals.