From lack of sleep can you lose eye focus or eyes get crossed?

Question

my boss works making hand made jewlery. and the other day when I came when you look at him his eyes were all out of focus. He said its from lack of sleep. But l think it could be something else. At that he had to drive his 4year old daughter home that night!!! Need Answers Imediately! THANX

Answer 1

yes , lack of sleep may cause a latent squint [ crossing ] to be apparent , but he still can see well .