Kittens with eyes crusted shut?

I have a litter of 5 kittens. One of these kittens has one eye that has been crusted shut, and another has both eyes crusted shut. when i discovered this, I dabbed the eyes with a warm washcloth and eventually eased them open, every day since then the eye is eather crusted shut again, crusted halfway shut, or has a bunch of yellow goop around it. On top of it all, just this morning I discovered that momma cat has yellow goop surronding her eye now. Is this serious enough that i should get medicine? or just continue as I have? it doesnt seem to be getting better