The massive sea creatures, called Echizen kurage in Japanese, measure up to six feet (1.83 meters) in diameter and weigh more than 450 pounds (204 kilos).

大型水生生物越前水母直径达六英尺（1.83米），重量超过450磅（204千克）。

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Prof Echizen said the glasses, which connect to a pocket power supply, would be reasonably priced, but there are some simpler alternatives.

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But recently fishermen off the coast of Japan have as often been pulling in jellyfish: the giant echizen kurage, Nomura's jellyfish, which can be over a metre across and weigh more than 150 kilos (330lbs).

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