There are a wide variety of assistive technology systems and/or accommodations that can help students with vision impairments and may be sufficient to allow your daughters to function well in a reg
Your question asks what can be done to address systematic problems within a school or school system, even if your own child’s problems have been resolved.
I am very upset to learn that your son has gone through at least 12 years of public school and is still reading at the first-grade level. How did this happen? Was he not tested over the years?