Night vision goggles, GPS receivers, Sure Fire lights and radios are among the dozen or so electronic gadgets that hang off an infantry grunt like ornaments.

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Headlights or room lights could be spectrally tuned to match the innate differences in day, night and peripheral vision, providing more comfort and safety.

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However, the RAIB also said Mr MacKay may not have seen, or had misinterpreted, the warning lights at the level crossing and appeared not to have been wearing glasses to improve his distance vision.

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