Next time I am in Changi, in addition to my bathing suit, I will add a pair of goggles to my carry-on.

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Twice a week for eight weeks, Breitkreuz donned a pair of goggles in a doctor's office and stared into a panel of 2, 000 tiny, pulsing orange lights.

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When wearing a pair of goggles fitted with small video screens, one of Dr Viirre's subjects has the impression of standing within a computer-generated panorama, which can be examined in any direction in real time.

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For example, just before the start of spring training, he tweeted a photo of himself shirtless in a swimming pool, buoyed by a tube and a pair of floaties, with goggles over his eyes and a snorkel lodged in his mouth.

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Mr Clare said he used props to add colour to his talks, including a pair of "beer goggles", from the Cornwall and Isles of Scilly Health Authority's Health Promotion department, which show how drink can affect visual impairment.

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For example, if you are skiing down a mountain and are fortunate enough to be wearing a pair of Oakley Airwaves, their wearable computer goggles, you might want to see an ad for drinks or dinner in the lodge below.

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