Thanks for the warning, lol. Experiment with it and you will "see."
Put two cards face up on a table in front of you. Then take off your glasses, hold them out in front of you as if that was your opponent and those were his cards. Can you see the cards' reflection in the glasses? Try different angles and whatnot. Then imagine how difficult it would be for your opponent to see that reflection if only the corners of the cards were being shown rather than all of the cards.
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