Two and a half years ago, we took Jack to the optometrist on our military base for his first eye exam. The doctor was able to get enough information to say that Jack's eyes were fine, but now we need to take him again, this time to a civilian provider. She's highly recommended by the schools and an acquaintance from church who is very calm and competent. I think Jack will be much more cooperative now, especially because he WANTS glasses, just like his friend at school. We went through this with our firstborn (who may now actually need glasses) two years ago when several of his friends got glasses.
Please share your experiences with optometry exams for kids on the spectrum. Eye exams are, of course, less invasive and have fewer weird sounds and smells and sensations than dental exams, but they're still definitely outside the routine.