'Smart' sunglasses show athletes a good time

  • Sunglasses that can show athletes' performance and heart rate data in their peripheral vision have been co-developed by companies from Germany and Britain. The sunglasses – dubbed "Informance" – display a stopwatch and heart rate at one edge. The extra components needed to do this add just 7 grams to the glasses' overall weight – which is much less than previous head-up displays.