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"Given the rapid development of modern laser diode technology and electronic information technology, it should be entirely feasible to develop a more advanced and intelligent photoacoustic watch that doesn't require a backpack," said Xi.

That study will follow 14 early-stage Parkinson’s patients for 4 years, seven of whom will be treated periodically with pulses of 670-nanometer light delivered to the brain via a thin laser diode cable.

Then they had to figure out a way to deliver flashes of light to regions deep inside the brain, and settled on a fibre-optic wire attached to a laser diode.

It spun out Avogy, a company creating new power systems for mobile devices, in 2010 and Soraa Laser Diode, a laser company in 2013.

Advertised for quick slimming, the device involves low-level laser diode panels that are belted around a person’s waist for a series of 10-minute sessions.