I can't confirm for other Myer stores, but Sunglass Hut Myer Eastland (Ringwood, VIC) will be running 20% to 50% almost all sunglasses today only.
We are also running 50% off all Fish, Fiorelli, Morrissey, Police, Polaroid and Killer Loop sunglasses.
Exclusions: Maui Jim, Bvlgari, Chanel, Tiffany & Co. & Oakley.
I know a lot of OzBargainers will argue that you can buy some brands for cheaper online. So may I say this would be more handy for cheaper brands like Cancer Council, Fish, Basque, Ralph and so on. By buying in-store locally you also receive 12 months manufacturers warranty and breakage protection (if you break your sunnies in the first 12 months, you can trade them in for a new pair 50% off at any point).
Available for all brands except the exclusions above, so that means Ray-Ban, Prada, Versace, Arnette etc. are all included. Can also be used in conjunction with Myer Staff discount (20% + 15%), but nothing else.