Hey Karen,
I too would recommend Dr. Steve Curtis and Renee Black at Riverview Eye Associates, if he has vision issues other than accuity, they will get to the bottom of it and Renee can work with him and bring up specific scores in areas like comprehension if they are caused by developmental eye problems. Many kids with other issues will also have this one, and it may be all you have to do, but chances are that this will be just one peice of the puzzle. Renee is great and will also make suggestions for you.
As for ADHD vs a learning disablity, you should know that these two are often comorbid, so sometimes it does not matter which one he is diagnosed with, if he is only having difficulty with reading, then the current popular intervention modle for all kids in this boat is called "Response to Intervention" or RTI. Under this modle, the school does not need to identfy the specfic problem, but they do need to provide the intervention (an Orton Gillingham based reading program).
The whole idea is that every child who has difficulty learning to read is provided with the intervention and then only the children who do not respond are indentified as "LD" so that schools have fewer kids with disability and kids get help sooner without the lenghty evaluation process. The way that LD used to be identifed was a descrepency between IQ and acheivment, but IDEA has moved away from a strict neccessity to have this to recieve services. Ask your school about RTI, and isnsit that he start with an Orton Gillingham, alphabet phonics, or other "dyslexia intervention" program available at your school (these are all basically the same.)
At the same time, request an evaluation for a reading disablity (in writing) from your school district. Don't sweat what they want to call it, if they provide the reading program he needs, it does not matter if they actually say that he is dyslexic or not.
As for ADHD, there are three types. Inattentive, hyperactive, and combined types. It is possible for a child to not seem hyper at all and still quailfy as ADHD (ADD is no longer a diagnosis-they are all three ADHD) There is another specialist that is qualified to diagnose ADHD besides psychiatrists, nerologists, and nueropsycholgists, that is a Developmental Pediatrician. For an initial evaluation, this is my preference, although treament after diagnois can be any of the medical doctors on the list (neuropsychologists and psychologists cannot prescribe the medication that most kids with ADHD will benefit from because it is a chronic medical condition that responds to treatment very well.)
If you have other reasons to suspect ADHD, it would be a very good idea for you to have him evaluated as soon as you can get in (this may take a while.) If the school evaluates him and will provide services and wants to call it ADHD (and if he is going to get the reading program he needs, don't worry about what they want to call it!) they must have a statement from a medical Doctor that he has it to collect funding from the federal and state government.
The best advice that I can give you is to own your own evaluations and to know more about your son than the school does. By that, I mean, don't depend on the school to be right, you have to know that what they recommend is the correct thing for him, and the only way that will happen is if you have as much or more evaluation than they do. Get both, and don't wait.
M., Educational Advocate, SAHM 3 children (with disabilities)