When I did the initial 18 months ago I had an appointment with the DAME. I did all the tests required with him during that initial appointment - excluding the ophthalmologist (spelling?).
The ophthalmologist fee was just under $200, and the appointment took about 4 minutes. He then sent the results to my DAME, who finished the application. (Edit, the DAME provided a referral to the ophthalmologist).
As far as being overweight, I'm not sure, but there is an ECG scan involved as well.
The DAMEs fee, for all questions they ask, ECG, hearing and anything else (maybe was a blood test also, can't remember) was also under $200 for me.
Plus whatever CASA charges...