Your eyes need to be adjusted to the darkness in order to really see these lights.

On a night as black as this, human eyes needed all the help they could get.

My eyes needed to readjust to the dark and I went slowly.

He thinks the eyes are green, but needs a closer look.

At the same time, your eyes also need to cross, or come together.

Our eyes needed to meet but once, and then we were never without each other.

His eyes needed a moment before they lit on the captive.

Sometimes, the results are not what were expected, and the eye might need to be re-tattooed.

The eye may need to be taped shut at night.

For optimum clarity at night, the eyes also need to be large.