What Ian Jordan said is very important.
My 6 yo son has hfa and sid and we are working on getting him assessed "orthoscopically"(sp?). He's very shy of new people so this may take time.
We had an appt with Ian Jordan and I found that I could see faces properly (for the first time in my life) when I looked through a coloured filter. I've always had problems recognising people I'd only met briefly.
I had never realised that other people could see a whole face in 1 look - I had to keep rapidly looking at different bits (l eye then r eye then mouth then back to l eye...) to guage expressions. The same applies when I look at a clock face (I had to look at both hands separately until I tried the filter). It also improved reading of fine print and distance/speed judging of traffic. The weird thing is it also affected my perception of fluorescent light flicker, sound, music, balance, pressure, smell, taste and temperature.
I will be interested to know if my son sees things as I do and whether other kids on the spectrum do.
Re an iep for sid - we home educate as ds was failed by "school action plus" (a misnomer). Its quite easy to put together your own provision at home - "The out of sync child has fun - activities for kids with sensory integration dysfunction" by Carol Stock Kranowitz has lots of ideas which you/school can tailor to your child's requirements.