IPhone 5s white flash in corner when using touch ID to unlock?

I got the iPhone 5s for Christmas and set the fingerprint touch ID up but when I got to unlock my phone using my fingerprint, it unlocks but there's a sudden burst of white light in the top left hand corner of the screen, it still unlocks fine and it doesn't happen when I put my pass code in?

IOS7 is buggy. Very buggy

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