Changing your child’s pediatric ophthalmologist once they turn 18

My child was diagnosed with strabismus at the age of 4. We had a wonderful experience with Dr. Otis Paul & Dr. Omondi N’yongo ( who was closer to home). After Dr. Nyong’o left PAMF, we were seeing Dr. Taliva Martin but last two appointments were canceled which was frustrating since we made the appointments months in advance and since it takes forever to get the next appointment we had no choice but to opt for their optometrist to completed the checkups. Now that our child turns 18, I’m not sure if a Pediatric Ophthalmologist can continue seeing them. Who does your child see once they turned 18 and weren’t considered pediatric patients? Would appreciate recommendations for someone who deals with strabismus. Our child will be heading off to college in another state and we would really like to see a specialist to make sure everything is OK.