Dual functions: prediction load or instant peek

This effect can be interpreted in various ways:

Nick has concocted a very believable and achievable "Double Thought/Do As I Do" that can now put this effect quite cleanly in the hands of anyone's performance

how to make the necessary props

and the spectator is asked to read the top line (an eye chart is printed in bold black letters on the backs of all four cards which are examinable

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