How do you see a specialist (doctor)?

I’ll have health insurance again soon, through my university. Yay! But I need to see an ophthalmologist for my special, special eyes. Do I go to an appointment with a normal doctor and say I need an eye checkup? I’ve been seeing neuro-ophthamologists since I was 4 months old but I’ve never had to figure this out myself. I need a referral for disability services and the agency won’t work with me until I have an updated eye exam, and I really need services. Tell me how this works.