The pod's window darkened automatically as the autopilot threw the craft into a sudden spiral.

He laid it directly before the field projector's crystal lens and at the same time the room darkened automatically.

The canopy darkened automatically to keep out the sunlight, but it still seemed painfully bright.

Dusk brought a lurid red glow to the windows, which automatically darkened to reduce the glare.

The $39 version has photochromatic lenses, which automatically darken in sunlight.

They are clear indoors and at night and automatically darken outdoors as light conditions change.

They could also be connected to a light sensor to darken automatically, say, when the sun comes up.

He felt a flash of golden light across his cheek and his faceplate darkened automatically.

The window in the mask is light-sensitive and automatically darkens when a person starts welding.

The front glass darkened automatically as the car turned into the late afternoon sun.