A refundable / non-refundable deposit/amount for 3D glasses may be collected at the cinema. The charges & terms vary from one cinema to another.
If you've already been charged for the 3D glasses while booking the tickets, it will be available in your order summary and email confirmation.
Also, you may get a pop up while hovering over the show timing to inform you about the charges, if applicable.
Enjoy the show! :)