Eye-care drugmaker Alcon said on Wednesday that the U.S. Food and Drug Administration has approved its treatment for dry eye disease (DED).

Some people can't form mental images. Here's what scientists are learning about the condition known as aphantasia—and why ...

Using a newly developed adaptive optics system called Cona, scientists peered through Earth's turbulent air to reveal the sun ...

Fake or polite smiles, on the other hand, usually involve only the mouth muscles. The eyes remain wide or indifferent, and ...

Mare Crisium, or the 'Sea of Crises', can be spotted on the night of May 30 as an oval-shaped dark patch on the moon's ...