Stargardt disease

My wife and I have been battling SSI for a long time now. Maybe someone on here can give us a straight answer. My wife has Stargardt disease and was diagnosed at the age of 7. She has never worked because fine print and detailed qualifications are hard for her. It is hard for her to recognize anyone from 8 feet away. She is now 25 and every time we apply we get rejected due to my income. I currently make $48,000 but I pay all the bills, which the majority I had before we got married. I carry insurance for both of us which only keeps going up. In addition to that, I am going to have to start paying my school loan back in the beginning of the year and we have a baby due in March. Is there anything we can do to get support, especially since she was diagnosed as being blind before she even turned 10?