Longform

After losing his sight at age 3, Michael May went on to become the first blind CIA agent, set a world record for downhill skiing and start a successful Silicon Valley company. Then he got the chance to see again.

One killer’s creepy obsession.

Daniel Kish had his eyes removed at age 1 because he was born with retinoblastoma, a cancer that attacks the retinas. But many people would never guess that he is blind.

The perspective-bending art of identical twins Trevor and Ryan Oakes.

Captain Iván Castro lost his vision in Iraq, but that didn’t stop him from running marathons.

The allure of invisibility.

How 3-D images affect the eye, plus proof that viewers have hated the technology since at least 1953.

How animals see.