His eyes brightened for the first time in many years.

Of course they were, she thought, and her eyes brightened.

That is to say, its eyes went dark and then brightened again.

The boy's eyes had brightened at the idea of playing this game.

Her eyes brightened, as if she were suddenly on to something.

His dark eyes brightened, as if this was what he lived for.

The girl's eyes brightened for a moment, and then she looked aside.

The young man's eyes brightened quickly and he shook his head as if trying to clear it.

Simon was still for a moment, but his eyes brightened.

John's eyes brightened as if he were thrilled to meet someone who hadn't heard the story.