Most people can see a short way into the infrared spectrum anyway. You need goggles with a really good filter to block out all the visible spectrum and a very

Most people can see a short way into the infrared spectrum anyway. You need goggles with a really good filter to block out all the visible spectrum and a very sunny day --- your eyes aren't very sensitive to infrared so you need lots of light. Given time for your eyes to adapt you can apparently see quite clearly, and it's also apparently looks just as weird looking as it sounds (never tried it myself). The trouble is it's rather dangerous. Your iris will be wide, wide open because your eyes think it's dark. Any, e.g., sun glare from reflective spots will be focusing an awful lot of heat onto your retina. And you need sunlight to produce a bright enough image to see... so it's not something you want to do without great care, or you're risking blindness. Reference: http://amasci.com/amateur/irgoggl.html http://amasci.com/amateur/irgoggl.html Just, if you're trying this, be really cautious.