Getting your eyes dilated is an important part of any complete eye exam. Once your doctor puts in the dilating drops, it takes about 20–30 minutes for your pupils to fully open, or dilate. After your ...

Experts disagree on who needs it and when. Here’s what the evidence suggests. By Michelle Crouch Perhaps the most unpleasant part of an eye exam is when the doctor squeezes in the dreaded drops to ...

On the other hand, Dr. William Barlow of the University of Utah's Moran Eye Center notes, "Dilation isn't always required. In fact, if you are seeing your eye doctor solely to get a prescription, ...

Time dilation is possibly the weirdest part of Einstein’s Theory of Special Relativity. According to time dilation, the faster you travel, the slower your time moves. But why does this happen? It’s ...

Pupil dilation provides a physiological readout of information gain during the brain's internal process of belief updating in the context of associative learning.