My father is 91.

[no_hypocrisy]

5. He has a PC MD but I don't think he sees him regularly.

Dad's a retired doctor himself and self-prescribes and I'm certain that he doesn't tell his PC about the other drugs. Meanwhile, the PC renews his other prescriptions.

And I'm certain Dad hasn't seen an ophthalmologist (eye doctor) in a long time. He uses those $6 glasses from the drugstore (magnifying glasses with a noserest). My guess is that if the eye doctor thinks that his vision prevents safe driving, he has to report that to the Division of Motor Vehicles and Dad will lose his license.

Another way Dad avoids being mentally evaluated is to evade his doctor.