My son Andrew gets SSI. I just went to the local social security office and asked for an application.
My daughter Grace also has albinism, but not as bad as Andrew's. We recently applied her and she got denied (which doesn't suprise me, no nystagmus...). In her denial letter it said she's gotta be 20/200 to qualify. Also it said, "Her visual field must be restricted to 20 degrees or less."
If your child has these things, one or the other, I think, then go right ahead and apply. You can also go to their website, ssa.gov (i think, do a search if i'm wrong...thats social security administration) and it will give you an online application to be being, but it will also tell you that you need to talk to someone at a local branch, but they should also give you a number to call.
Good luck!