He went on with drooping head and eyes that stared achingly here and there.

That was the worst of his discomfort--his eyes.

Lack of sleep and the strain of looking, looking, against wind and sun, had made them red-rimmed and bloodshot.

Miss Allen's eyes were like that, and so were the eyes of all the searchers.
In spite of himself Andy's eyes closed now.

He had not slept for two nights, and he had been riding all that time.