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Corona (?) around light sources in the dark

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becausejust	Corona (?) around light sources in the dark		Lead	[-]
Registered User Posts: 10 02/04/08 3:54 AM	Remove this ad Hi guys, when it's dark outsight, I see symmetric light with decreasing intensity around street lamps (similar to the natural lunar corona, e.g. http://de.wikipedia.org/wiki/Bild:Lunarcorona.jpg ). I always thought it's because light reflection in the atmosphere. However, at the weekend I looked at a street lamp which was paritally hidden by a tree trunk, so the corona should also be hidden by the trunk. But, I still saw the corona (as if it was shining thru the trunk), so it's not "physically" located around the light source, but must be created somehow/somewhere in my eye/brain. Normal/abnormal? Regards bj
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ohCRICKETS		#1	[url]	[-]
Registered User Posts: 383 02/04/08 4:29 AM	I see that too. But then again my vision isn't normal. Eins - Hier kommt die Sonne Zwei - Hier kommt die Sonne Drei - Sie ist der hellste Stern von allen Vier - Und wird nie vom Himmel fallen Fünf - Hier kommt die Sonne Sechs - Hier kommt die Sonne Sieben - Sie ist der hellste Stern von allen Acht, Neun - Hier kommt die Sonne
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jruddy		#2	[url]	[-]
Regular Visitor Posts: 413 02/04/08 9:57 AM	Before this wonderful thing called visual snow came along, I enjoyed astronomy as a hobby - though not so much since my two little boys came along. There's something about sleep I've learned to appreciate now... Yes, corona is an atmospheric effect - it is obvious around the moon on a hazy night - and is very annoying to astronomers. But in our cases it also seems to be a symptom of visual snow. I get it around stoplights in the day time, for example, and car's tail-lights at night. (As well as headlights, etc..) This isn't due to any haze or fog in the atmosphere, but something goofy in our heads. <sigh> my telescope sits collecting dust... Come on Topamax, kick in already! Jim
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shannon3fh		#3	[url]	[-]
Regular Visitor Posts: 449 02/04/08 10:46 AM	Remove this ad no i dont see that.
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becausejust		#4	[url]	[-]
Registered User Posts: 10 02/05/08 8:29 AM	I googled a little bit. It seems that that kind of corona is normal. It's caused by the aperture of the eye. See http://www.anu.edu.au/Physics/new/commercial/VCE%20UNIT%204A.doc . There the author says: "When you look at a distant street lamp there may be a corona surrounding it. This is actually a diffraction pattern determined by the aperture of your eye. Occasionally the moon exhibits a corona due to diffraction from the small water droplets or ice crystals in the air above us. " bj
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Jonny4Life		#5	[url]	[-]
Regular Visitor Posts: 180 02/05/08 10:05 AM	I think i get that too when i look at a street lamp from distance. Jruddy, i feel your pain. I've always wanted a powerful telepscope so i can lose myself in the wonders of space. Not anymore though
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ksomething		#6	[url]	[-]
Registered User Posts: 5010 02/05/08 1:29 PM	Remove this ad because just, there exists a visual symptom which is actually called " corona phenomenon ", where you see an extra contour around objects (animals, persons, etc.) This can occur as a transitiry or as a persistent symptom in migraine. jruddy has posted an illustration here: http://thosewithvisualsnow.yuku.com/topic/3663?page=2
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Corona (?) around light sources in the dark

Corona (?) around light sources in the dark