out of/from the corner of your eye

If you see something out of/from the corner of your eye, you see it but not clearly because it happens to the side of you.

用眼角余光(看)，不经意(瞅见)

I saw something move out of the corner of my eye.

我无意中瞥见有东西在移动。

Will saw movement from the corner of his eye. Pale shapes gliding through the wood.

威尔的眼角余光瞄到白色身影穿过树林。