I don't know if the weakness you noted is necessarily related to albinism. I've been surprised how robust albino discus are.
I've bred albino angelfish and eyesight is clearly related to how the fry are raised. For best quality fish, albino angelfish fry are raised in subdued light. I have to put a towel over the tank even with just overhead room lighting. Bright light can actually blind them.
Whether albino discus have the same issues, I don't know.
Willie