I found a stray kitten outside so I brought him in my house everything was OK with him until I brought my other cat who goes outside back in the house ever since I let my cat go outside white lids show up from the bottom of his eyes but now there OK. But now the kittens one eye is shut tight at first stuff was coming out like white or green stuff and his eye wasn't shut but now his whole eye is shut. What does this mean?? And is there a way for his eye to get better? :confused:

It sounds like he has an eye infection.

Unfortunately the only way to treat it is to get soe drops from your vet.

In the mean time just wash the kittens eye with a cloth and some luke warm water until you can get him there to make him more comfortable.