(bump)
As this post has gone unanswered until now, I will just offer a few thoughts - Schools used to perform vision and hearing screening, possibly they no longer do, or not in your area. Schools also used to require a signed form following an annual exam with the child's pediatrician or family doctor (during which vision and hearing screening was ostensibly conducted, with referrals to specialists if needed).
Regarding the piece-meal approach to testing and diagnosis of factors which could impede learning, unfortunately there may be more specialists and less coordination, integration, and oversight of services than there used to be.
If you have a good regional Children's Hospital, that may be one place to start. If they do not offer coordinated, integrated services to screen for learning difficulties, they may be willing to establish such a practice. So much of what we do may not help our children directly, but may help others, raise awareness, and change society for the next generation. In many ways, we are pioneers.
If asked directly, the professionals you are working with may be able to recommend other doctors/specialists/screeners/health care providers they have coordinated with previously for other patients.
It is a tall order for a parent to function as a child's case manager, especially if a parent has limited familiarity with medical and/or educational systems. Wishing you all the best with the ongoing diagnoses and advocacy for your child.
