The Reference Desk/Where did the Doctor get the 3D glasses from in Episode 13 ("Doomsday"), Season 2?

From Tardis Wiki, the free Doctor Who reference

So I was just wondering where the Doctor got the 3D glasses?

"He used a pair of 3D glasses when observing the effects of the Void on people and objects. (TV: Doomsday)" http://tardis.wikia.com/wiki/Glasses

Thanks in Advance!

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