Refraction is the diagnostic procedure used to determine your best-corrected vision. This can be achieved at all ages using different techniques, but usually involves looking through a device with adjustable lenses while the doctor has you read letters on an eye chart. Refraction must be performed in order for the doctor to prescribe glasses. For some medical conditions and for most children who have been referred after a failed vision screen, refraction is needed even if glasses are not prescribed. Unfortunately, the majority of insurance companies (including Medicare) do not cover this essential procedure. If your insurance does not cover refraction, you will be billed accordingly. The current fee for refraction is $85 (subject to change) and is due on the day of service.