You do not require a prescription if you are simply looking to buy frames only. Simply select ‘Frames Only’ when adding to cart.
If you would like to order prescription lenses with your frames, you’ll need a valid prescription. Most prescriptions are valid for 2 years from the date the prescription was determined. A copy of your prescription should be given to you after a consultation with your eye care professional, in accordance with Australian law.
If you don't have a copy, then simply get in touch with your eyecare professional and ask them to supply it.