Hello..the investigations are rightly suggested as Uveitis may have systemic associations..so need to fine out the root cause if any..these are the baseline investigations and if comes out to be normal then further investigations may be suggested. So it's like something is going on elsewhere in the body which is reflecting in the eye and we need to find it. But Uveitis can be only limited to eye proper too. So follow all the instructions, treatment and investigations suggested by your Ophthalmologist. Regular follow up is must.