I just got some new Oakley prescription sunglasses with what they call an "Ice Blue Iridium" tint.  I've noticed while driving that certain auto windshields (Mercedes and Chevy Tahoe) have a distinct purple tint when I'm wearing the glasses.  All other car windshields look the same.  Very curious as to what is causing this.
136567
polarization is a way of filtering out all light except for the light that oscilates in a certain direction.  Light from the sun oscilates in all directions, but when it is reflected from a surface, it tends to oscillate very heavily in a single direction, which makes it amenable to filtering by polarlized lenses.  Sub glasses are therefore designed to minimize glare from reflected surfaces.  Some model cars also have polarized windshields for exactly the same reason - to minimize glare from sunlight bouncing off surfaces - like the hoods of other cars.  If you look through two polarized lenses, if the polarization of the two is parallel then most light passes through - but if they are perpendicular, then most light is blocked.  You are seeing light from the inside of a car that is passing through two polarized layers - that of the windshield and that of your glasses, and it is likely that the relative angle of alingment of the polarization between the two is somewhere between 0 and 90 degrees.  \n\nHere is something to try - next time you see a display of polarized sunglasses - hold one pair before your eyes - rotate the subglasses - and look at all the other polarized subglasses on the rack as you do so - you'll be amazed to see how all the glasses on the rack turn from clear to opaque as you rotate the pair in your hand
631295
No its actually common. I have the same thing. Mine is a spot though. You might have a cataract. Go get it checked out just to be sure. most likely its nothin.
158114
I have heard they are caused by dust on the lens or water.  However, my daughter can't seem to have a pic taken of her without either orbs or long thin white smokey ribbons all around her.  Even though she is only 22, I call her an old soul.  She is a sensitive, meaning she can sense and feel things others can't.  I am the same way.  I believe these may be spirits around her.
88289
Each material absorbs different wavelengths of light. It turns out that glass an air absorb very little in the visual range of the spectrum (although they absorb in other regions). However, they do absorb some. If you had a piece of ordinary glass that was very thick, it wouldn't pass much light. In fact, one reason that mountains in a distance look blue is that the longer wavelengths are absorbed by the air. On the other hand, it is possible to have pices of metal that are so thin that they pass light.
594519
Hi I have those too.  I was listening to a natural doctor on AM Radio and he told another lady to go to the eye doctor just in case it was something different, but that there isn't anything that can be done for them.  They are just annoying.
195145
In order to coat mirror glass with a thin layer of silver metal, silver is introduced in the form of another salt, such as silver (Ag) nitrate (NO3), written chemically as AgNO3. In water, silver nitrate breaks up: \n\n\n\nNote that, unlike the other ions discussed, the nitrate ion is not composed of one chemical element, but two, nitrogen and oxygen. For that reason, nitrate is known as an ionic complex.\n\nWhen a silver salt, such as AgNO3, is applied to a glass surface already treated with SnCl2, the tin ion Sn+2, already missing two electrons, gives up two more, taking on a final electrical charge of "plus four" (+4). Silver, which has a "plus one" (+1) charge in the water, takes up an electron from tin and "drops out of solution" or precipitates as silver metal, represented symbolically as Ag or Ag0 (the zero represents zero charge). When this happens, silver deposits as a shiny surface on the glass, and a mirror is created. Here's one way to represent what is happening among the various ions: \n\n \nSee the reaction in \nhttp://www.science-education.org/classroom_activities/chlorine_compound/stannous.html
262610
Most of the time, those are brief after-images; it's a reflection of the processing of images by the retina.\n\nOn occasion, it can reflect retinal pathology--retinal detachment, occlusion of a blood vessel, etc--and it can be the prodrome of a migraine.\n\nIf it only occurs briefly and with closed eyes, it is generally nothing; the disease states usually will cause the little dots whether your eyes are open or closed.
220601
I get that sometimes too. I have hypoglycemia. I also take a medicine for depresseion called Welbutrin which I have taken for 4 years now. Also I have reached the ripe age of 41!  I think all these things combined is what causes my spots, blurryness and shadows. I was told by my eye doc that the floating spots that move are age spots that most people get with age (over 40). They are protien fillers that build up. The sugar imbalance cause the color spots. Eating more protien in my diet and less fats/carbs helps me.
342940
It is caused by electrons being emitted...(aka photons aka light) but certain metals give off certain colours according to their wavelenght...and according to the line spectrum....
541068
answer 1 was correct its Auto Glass Specialist's\n\nHarmon has black vans or white if its Glass Doctor
68192
I know the new Mercury and Lincoln vehicles with the LED's don't seem to flicker much, but I agree it seems that Cadillac's have a bit of flicker to them. Maybe they should put one of those epilepsy warning stickers on the back of 'em!
653433
On my way to work in a mild rainstorm, two suv's were facing the same direction, but obviously the owners were mad at each other, waiting for cops.  The hood and side panels of the noses of each vehicle were peeled back slightly like a banana peel! Huh? How did this happen?  No crinkling or bending or tearing, just peeling. Weird.
8240
Water and ice are transparent and light passes through without any portions of the visible spectrum being absorbed or reflected. On the other hand, most of the visible (white) light striking a snowy surface is reflected back by the countless tiny surfaces of the snow crystals giving snow its white appearance.\n\nOne can think of the ice or snow layer as a filter. If it is only about a centimeter thick, all the light makes it through and it is seen as white, but if it is a meter or more thick, mostly blue light makes it through. More red light is absorbed compared to blue. Not much more, but enough that over a considerable distance, say a meter or more, the light emerging from the snow layer tends to be made up of more blue than red light. Poking a hole in the snow and looking down into the hole you can see blue light or the blue color associated with the depths of crevasses in glaciers. In each case the blue light is the product of a relatively long travel path through the snow or ice.
672596
I have a pair that have no rims around the lenses.  I love mine and they look good.  It's all a personal choice.  There's no difference in clarity or power of the lenses.
54616
are you sure its fiberglass? I dont think they use that for windshields, in which case it might be something else that you are experiencing allergic reactions to. Go see a doctor if you are having allergic reactions, or describe your symptoms on here a bit better so maybe a doctor can help you on here.\n\nhttp://en.wikipedia.org/wiki/Windshield
133068
Normally.. everyday use....How do polarized sunglasses work? Well, we are all aware of the fact that light reflection from surfaces like a flat road or smooth water has a horizontal polarization. Such horizontally polarized light is then blocked by the polarizers in the lenses which are vertically oriented. Thus, we can ensure proper eye protection.\n\nThere has been no clear evidence that NIGHT driving with polarized glasses does any good.
672441
Lighter colors reflect sunlight .Trust me ,I have owned a black truck and they get damn hot.Lighter ones get hot but nowhere near as hot as a dark one