Slashdot Mirror
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!"
Don't go out of your way to expose your eyes to UV!
Ultraman
Do black lights actually look black when on to most people? I thought they only looked black when they're off. To me they've always looked white with purple edges when on. I thought that was normal.
Cool art gallery, if you're into that sort of thing.
1. Check to see if this ability enhances your sight during low level light. 2. Check the boundaries of your abilities and record such data. Is there a certain amount of UV light you can and can not detect? 3. Use this ability for a stealth motion detector. If a robber can't see in the dark, but you can, this would be a advantage. 4. Use this ability to sneak in late at night to prevent people yelling at you! :p
5. During a Solar eclipse, TOTALLY watch it, with proper protection of course. You will be recieving a special view that few humans will ever experience. :3
Restore the madness of youth's lechery
Back in WWII, when the medical treatment was much more primitive, elderly persons in England, who had vision partially restored by cataract surgery, were asked to watch for long wave UV covert signals, from off the coast vessels, as part of the war effort. This may be an urban legend -- it is unanswered on Snopes http://message.snopes.com/showthread.php?t=25056, but I do recall reading about it as a child, I believe in a commentary written by Arthur C. Clarke. But the memory is vague, and who knows where Clarke might have learned of it. So as something vaguely remembered from a book half a century old, that may or may not exist, where the original author may or may not have had first hand knowledge, ... well, by Internet standards, that's your proof right there!
-- Perhaps I see less than some, but more than many.
Sorry; you do not have special UV-sensitive super-powers. So-called "black" lights are not, by any stretch of the imagination, UV-only. They have a filter on them that blocks most, but not all, visible light. They are called "black" lights because the UV causes appropriately fluorescent and phosphorescent materials to glow out of proportion to the visible light emitted by the bulb.
Obviously, with his newfound UV-vision powers, he is ready to decode(or manipulate) the hidden coloration used by plants to attract bees...
As HiveLord, numberless swarms of eusocial attack insects will bend to his will! The crops of man shall be bounteous, or wither unpollinated, by his hand! His amazonian suicide warriors will throw themselves at all foes, laying down their lives that the Swarm's venom may find its target!
I understand that the definitive text on ultraviolet astronomy was written about then by an astronomer who had also been through the operation.
For him astronomical objects with high UV emission were "naked eye objects". He could just look through the telescope eyepiece and zero in on interesting stuff, when others had to wait for the film to be developed.
Not as big a deal these days, with 'scopes aimed using semiconductor image sensors rather than naked eye. But may still be an advantage.
Bantam Dominique roosters crow a four-note song. Once you've heard it as "Happy BIRTHday" you can't NOT hear it that way
Flowers are often more varied in the UV than in the standard visible light range.
No Capes!
Do I really have to suggest to a bunch of /.ers to try and see thru clothing using UV light?
If I could see through clothing, I don't think I could ever shop at Walmart again.
W..w..W - Willy Waterloo washes Warren Wiggins who is washing Waldo Woo.
Ultraviolator.
Though I guess that could be open to misinterpretation.
I can't say this has been particularly more useful to me although I do think I see rainbows as 'wider' than most people with a much thicker "purple" band than others seem to see. Totally subjective and something I can't substantiate but I think I am more sensitive to sunlight as well.
"It takes considerable knowledge just to realize the extent of your own ignorance." - Thomas Sowell
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?
Babies can see further into the UV than adults, probably due to the gradual yellowing of the cornea, which usually becomes apparent in old age. Water reflects UV to varying degrees, too.
That would be tetrachromats, who can see richer colors (the fourth cone is somewhere between red and green) but not ultraviolet. It is however extremely rare. Totally different phenomenon AFAIK, and girls can have it due to having two X chromosomes. I've never heard of humans seeing into ultraviolet, but I suppose it is possible.
"None can love freedom heartily, but good men; the rest love not freedom, but license." --John Milton
He should wear ultraviolet skin tights, then most people won't see them and he can pass incognito. Plus, he won't need a phone booth.
Raptors use UV vision. I read a couple of articles about birds floating in the sky, watching the ground for fresh rodent urine. The urine gives off a bright glow under UV, that is invisible in the "visible" light spectrum.
Don't tell Randall about this! He's just recently calmed down.
Faster! Faster! Faster would be better!
That wikipedia article you linked to said that the new type of cone that some women may have "lies between the standard red and green cones". It has nothing to do with seeing ultraviolet.
Well, I can say that your assertion is flawed. I am a male. I can also see UV light with one eye. I had a congenital cataract (it was there from birth). When I was 19 (almost 20 years ago), the vision in one eye was 20/200 due to this. They cut the old lens out, and slid the new one in. At the time, we were advised to leave the bandage on for a week, so I did.
When I removed the bandage, I didn't see anything remarkable, other than I could see clearly. I also found that the lens was not easy to bend, so my focus in that eye has been fixed ever since.
Around Halloween time, I had my first experience under black lights. Well, it was more like extreme pain. The natural lens filters out the UV light. Being bathed in this bright UV light was roughly like looking straight into a very bright light.
Over the next 5 years or so, I became adjusted to being able to see UV. It's not a big deal. Sometimes I see the rough equivalent to visual feedback when looking at particular colors (blue, violet, and UV). Each eye is seeing a different color on the same object.
It's hard to explain what it looks like to most people though. A black light normally doesn't really look like anything. I see a bright blue light instead, only in one eye. Sometimes I close one eye, then alternate, so I can figure out what color the rest of you see. It's a very bright blue. Kind of like the difference between bottle of mustard, and a yellow caution sign. Well, except most of you would never have seen the yellow caution sign, so you won't have a frame of reference.
So is it the whole UV range? Hell if I know. Maybe. Maybe not. I've never been presented with a color wheel that covers UV colors to help determine the full range.
I always wear UV & polarized sunglasses when I'm outside. Light is really bright, especially in areas with a clear sky. Going from LA's smog to Florida's bright blue sky is like living in a house with 40W bulbs, and then replacing them all with 100W bulbs. Sunglasses are generally a good idea, but if I don't have them, I end up walking around with one eye open.
About 20 years later, I still see it. I was at a convention over the weekend, and they had blue backdrops behind the speakers, with black lights pointing at them. In one eye, it was a dull blue glow. In the other eye, it was a distracting bright blue light. So I watched most of the time with one eye open. :) It could have been worse. I would be blind in that eye by now.
Serious? Seriousness is well above my pay grade.
Before you go off calling someone a liar, maybe you should check up on it first. Google "see ultravilot". I just replied to another of your messages. I have a replacement lens in one eye, so I see both ways (normal and altered vision).
The following are quotes from http://www.guardian.co.uk/science/2002/may/30/medicalscience.research
Serious? Seriousness is well above my pay grade.
No, but do natural lenses absorb UV?
Yes, and the extra type of rods she is talking about is _between_ the red and blue kind.. so all it does is allow greater differentiation of already seen colours, i.e. absolutely nothing to do with UV at all. So 2-3% of the female population can see a crazy amount of shades of colour.
The blue cells _can_ detect into the UV range, in both men and women, however normally this is blocked by the natural lens.
Not really; The paints are made from different materials which may or may not do the same thing in the ultraviolet range as the real objects he was painting.
Or he can see UV reflected by sunscreen lotions. That would be a good test to check if he can really see UV. I guess that the reflected wavelengths of different products might vary and he might not be able to see all of them, nevertheless a crowded beach should provide a good enough sample.
These women just say "pfffrrt I can seen all colours, even ultraviolet!"
To which the researchers tried to explain how that's unlikely and would try to run some tests..
As suddenly the women says "Is it me, or is it getting hot inhere ?" while there's some 70s funkmusic that comes from her bra, which is bulging...
As the scientist tries to remain his posture, and tries to convince the woman with all spectrum vision he needs to investigate her claims.. she replies "Investigate this.... doctor..." while she pushes her boobs in his face and scientists view is blurred and limited to only a few spectrums... While making up his results out of shame to write down his actual personal findings.
This is generally how women partake in research.
I think we can keep recursing like this until someone returns 1