The correct answer is the principle of extraordinary claims
.In 1979, an astronomer, Carl Sagan, stated that "Extraordinary claims require extraordinary evidence". By this he meant that claims that cannot be backed up by scientific evidence are highly questionable. In this instance, where television commercials advertise special sunglasses that allow differing amounts of light to the left or right eye,there is no scientific evidence that these "special sunglasses" function this way, thus demonstrating the principle of extraordinary claims.
