“Wondrous as it is, our sense of vision is clearly not without certain limitations. We can no more see radio waves emanating from our electronic devices than we can spot the wee bacteria right under our noses. But with advances in physics and biology, we can test the fundamental limits of natural vision. “Everything you can discern has a threshold, a lowest level above which you can and below which you can’t,” says Michael Landy, professor of psychology and neural science at New York University. ”
http://www.bbc.com/future/story/20150727-what-are-the-limits-of-human-vision
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