On The Case - JB Magic

A hard spectacle case is shown, it has a random eye chart printed on one side just like an opticians.The opposite side is shown and is completely BLANK! A card is selected from a regular deck.

You now remove your invisible mind reading glasses from the spectacle case. After a couple of minutes by play with invisible glasses and you guessing the card wrong several times.

The spectator is asked to read the eye chart on the case. it now reads
THE CARD YOU SELECTED IS Every letter has rearranged itself in a BLINK!

Slowly you turn the case around, THEIR CARD IS ON THE BACK OF THE CASE!