See something out of the corner of your eye

Pro Tip 1/3

Peripheral Vision

This phrase emphasizes noticing something unexpectedly by using your side vision, without turning your head.

While reading, I saw a flicker of movement out of the corner of my eye, and turned to see a bird fly by.

Pro Tip 2/3

Subtle Alert

It suggests an awareness of your surroundings that alerts you to changes, even while distracted.

Lost in thought, I saw her leave the room out of the corner of my eye.

Pro Tip 3/3

Momentary Noticing

Indicates a brief, often unimportant observation that doesn't interrupt what you're mainly focused on.

He didn't look up from his book, even when he saw a flash of lightning out of the corner of his eye.