photoelectric cell
photoconductive cell
photocell
electric eye
magic eye

"Now my magic eye can always tell a hero," he finished.

Suppose he charms you with one of his magic eyes?

Finally the green light on the magic eye flickered and shrank for good.

It was not as if I had been an editor and had the magic eye.

"The Wizard's magic eye can fall on us, and he will then know-!"

The magic eye restores the boy's sight, but turns him into a fierce warrior.

Gave him the magic eyes, then bit him and dragged him off!

Then, magic eyes or no, they would starve along with all the other poor fools who had wandered away from the marked path.

Have you ever heard of the magic eye?

Did I not tell you I had a magic eye?