Call your vet to see if there is an optimologist vet in your area. Eyes are different, and if you take him to your vet then the vet tells you to go to the optimologist, then you will be paying TWICE for all the same tests.
If he is squinting- he could have a scratch or ulcer. Tidus has been through a terrible time, because I waited it out for a few days, then he scratched the other eye because he was rubbing the one with the ulcer, and it was back and forth for a long time now.... he ended up having his lids stapled to keep the swollen skin around his eyes from poking in the eye.
Squinting usually means pain.... now I have spent a small fortune on getting his eyes fixed and I think it is cuz I waited too long. I would take Bear in asap- just in case.
It's Saturday, which really stinks- so I am going to refer you to my threads for Tidus on what you can use for now to help him be more comfortable. There are 3 now... my poor baby has 3 threads. Ugh.
Dry eye is common in bullies too, so you def. want to have him seen.