Single Eye Closed on 2 week old chick

[AnimalGeek23]

I found one of my 2 week old B.O chicks this morning with a single eye closed. It seemed lively and came to my hand when I reached out to it. The other eye was open, and no lethargic behavior was shown.
Right eye(closed):

Left eye(bright and open):

It would open it’s right eye periodically but kept it shut most of the time. Can someone tell me why/the problem? Everything was fine yesterday, we discovered this this morning.

 

[Freeloading slacker]

Since the chick is not acting lethargic and there's no discharge from the eye I would just wait and keep a close eye on it, maybe it got something stuck in its eye.

 

[EverythingDucks]

Chickens will often sleep with one eye open and one closed. This is because one side of their brain stays awake to watch for predators while the other sleeps. He may just have something stuck in his eye though like @Freeloading slacker said, if he's moving around.