Got a pair of these from prof Silver himself. https://www.ted.com/talks/joshua_silver_adjustable_liquid_filled_eyeglasses?language=en https://www.ted.com/talks/

Got a pair of these from prof Silver himself. https://www.ted.com/talks/joshua_silver_adjustable_liquid_filled_eyeglasses?language=en https://www.ted.com/talks/joshua_silver_adjustable_liquid_fi... At first glance it would seem the same concept. How is it different (if) ?