Wow... I can't believe no one has replied... I get spinning rings of lights that affect my vision. I used to only have this when I was pregnant but as of lately I have have been getting this symtom at least 3 times a week with NO chance of a baby on the way. the fan blades is a good way to discribe I guess... mine are more like rings that start out small in the center of my vision and then increase in size until 90 percent of my vision is blocked. It lasts for about 20 to 30 minutes and then it is gone. I once thought it was trigger when I was near flurecent lights but that has been proved unture as it has been happening in any kind of light. I have gone for blood tests as I have weight loss then gain (can fluctate 8-10 pounds a day)and nasuea all the time... (NOT PREGNANT LOL). Anyone else expriencing these rings of lights?

Yes, I too have had the spinning blades! I've been describing them as a slowly turning double helix! No idea what it is, mine lasted about 20 - 30 minutes as well. The first time was a few months ago when I was giving a reflexology treatment to someone, and the second time was earlier today about an hour after I had treated someone else. I felt a bit sick afterwards, but no headache. I too am amazed no one has said what it is! Will keep searching...

i too have had haing the same thing most mornings like this one i get these spinning lights in right eye it gets pretty full on and i cant stand up, its like ripples in water after throwing a stone in thats spinning out of ontrol i have had quite a bit of eye surgery on that eye all the eye doctors havn't had any anwsers and put it down to some thing to do with surgery but doesn't sound like any of you have had that would love to know what it is

My spinning lights are very colorful. Bright blue, red and yellow and at the outer part of my right eye. It's very distracting but the strange thing is, I don't notice when it quits. I've been to several reputable ophthamologists and no one can give me an answer so I live with it.

I too get the spinning lights!! Starting out small then getting larger, lasting about 20 to 30 minutes as well. What is this, can someone please post an answer!!

Try googling "Scintillating scotoma".
I'm real sure that this is what we have going on.
I've even found pictures of it and it matches exactly.