Your exam may be covered by a vision plan or by your regular medical plan. If it is a routine anual exam your vision plan will apply. If it is a visit for any non routine concern your medical plan will apply.
Non routine examples are infections, dry eyes, headaches, pain, finding anything other than a glasses prescription change. Medicare also will help out if we find cataracts, retina issues, infections, etc. The part where we are checking your glasses prescription is called refraction It is never covered by medical insurance or medicare. This is because it is considered by insurance to be a routine procedure not related to a medical issue that has developed.