Yes but no. The rule is in this document, section 2. (requires a pdf download, so the following is extracted)
The right of the patient to the prescription is provided both by common law and by Medicare regulations that are binding on all participating optometrists.No additional fee should be charged for providing a copy of the prescription at the conclusion of an examination… patient also has the right to receive a copy of the prescription at any time after the prescription has been determined. When a patient requests a copy of the prescription some time after it was determined, the optometrist should respond to the request within a reasonable amount of time. Optometrists may charge the patient a fee commensurate with the costs involved in supplying the copy of the prescription.If a patient is examined and his or her prescription has not altered, the patient still has a right to the prescription. If a patient does not require spectacles, no prescription need be issued.Patients should be informed of their right to a copy of their prescription before any dispensing (including selecting a frame) has occurred. This can be done by posting a notice to this effect in the practice where it will be seen by patients.
