This depends on the reason for the visit.
Examinations for medical care, evaluation of an eye complaint or to follow an existing medical condition are billed to the patient’s medical insurance plan.
Examinations for the purpose of checking vision, screening for disease, or updating eyeglasses or contact lenses are billed to the patient’s vision insurance plan, if the doctors participate in that plan. Many vision plans will not allow coordination of benefits (billing of both plans), please verify your coverage with your carrier before your appointment