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Fourteen men reportedly have had vision loss while taking the erectile dysfunction drug Viagra, say ophthalmologists at the University of Minnesota. The men lost only part of their vision. Cases appear to be very rare. Most of the affected men had other health problems and the structure of their optic nerve (the nerve that handles vision) raised their risk of the condition. “The number of cases is extremely small,” says Howard Pomeranz, MD, PhD, who details seven of those cases in a new report. The condition is called nonarteritic anterior ischemic optic neuropathy (NAION). “The likelihood of this happening in...

Women see scarlet, men see red Jennifer Viegas Discovery News Wednesday, 4 August 2004 The world may appear a more colourful place to women, according to a new study that finds many women perceive a greater range of colours than men, particularly shades of red. The U.S. study, which analysed DNA from populations around the world, is published in the September issue of the American Journal of Human Genetics. How men and women see the world appears to relate to evolution and how our early ancestors found food. Men were likely to have been surveying the landscape for prey to...