One of my babies eyes looks a little glazed. A tiny part of it seems cloudy or something. Could it be from bumping into something? My water is fine, ammonia is 0, nitrite is 0, and nitrate is 5ppm.
The Oscar is acting like his normal tough guy self, keeping the other Oscars in check.

The Oscars all have scrapes from bumping into stuff, when chased or spooked.

Last week I think Marcus stated if it's one eye that's cloudy it may be caused by injury.
As allways pristine water conditions are a must for recovery.
Check if you can find what he hurts himself on and see if you can remove that from the tank.

Well they like to take cover under a log that my catfish lives in.

My O hurts himself badly when chased by my Vieja, but I never see it happening, or I'd be threatening my Vieja with the net, and he hates that.
Are your fish chasing eachother?

They don't really chase eachother, one of them just seems to open its mouth and give other other ones a 'love peck' once in a while. But doesn't chase them around the tank.

lol, "Love peck", i like that.
Could be your O just made a bad move at the wrong time.
If the leision is superfiscial, it should heal just fine, given some time.

Okay sounds good!

hitting the glass wall when darting could make an oscar eye blurred
but with pristine water and good feeding habit, it will heal in no time