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Ask Slashdot: How to Exploit Post-Cataract Ultraviolet Vision?
xmas2003 writes "I recently had cataract surgery with a Crystalens implant. With my cloudy yellowing (UV-filtering) natural lens removed, I see the world in a new light (more on that in a moment) as everything is brighter and colors are more vivid ... plus in focus.
As a typical Slashdot reader, I've been myopic since childhood, so it's wonderful not to have to wear glasses/contacts for distance. One interesting oddity is that I can now see ultraviolet light — it seems that there are a few people who have photoreceptors sensitive below 400nm into the UV spectrum. I've done some testing with a Black Light and UV filter to confirm this but would love to do more conclusive testing such as using a Monochromator — anyone in the Boulder, Colorado area have access to one? And any suggestions from Slashdot readers on how I can further explore this phenomenon? While I can't see dead people, I guess I have a 'superpower' ... although I'm not sure a middle-aged suburbanite dad should don purple tights and cape to become a crime-fighter!"
Flowers are often more varied in the UV than in the standard visible light range.
Ultragirl. I didn't even click the links yet, because I already know that only females are gifted with vision in or near the ultraviolet part of the spectrum.
although I'm not sure a middle-aged suburbanite dad should don purple tights and cape to become a crime-fighter!"
You need to take some remedial biology lessons, I think.
Isn't enough that I ruined a pony, making a gift for you?
UV is a very wide spectrum. Near-UV isn't too scary.
UV-A (400-315 nm) is OK for short-term exposure. Your pupils won't constrict like they do for visible light, so keep the intensity low. Plain old blacklights are 350-400nm with the peak at 365nm, plus a small peak in the very bottom of the visible spectrum (which is the purple glow).
UV-B (315-280 nm) will probably be invisible, and it will do bad things to your eyes, so please stick to very low intensities if you want to fool with this. Read up on the risks first.
UV-C (280-100 nm) is utterly hostile to biology - the upper atmosphere filters this range out so life never evolved mechanisms to deal with it. Actually, UV-C is hostile to damn near everything: just from my own experience, it bleaches everything, and most plastics will degrade and become brittle with mere hours of exposure. I've test-fired a 185nm lamp in the open for a few seconds (wearing goggles!) and even across the room you can instantly smell ozone forming as it starts ripping oxygen apart. Stay away!