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Medical Forum / General / Vision / July 2005Blue eyes
Blue eyes (irises) are blue due to Rayleigh scattering of light. However, I am not aware of other transparent media of which a thickness of just a few millimeters appears blue with such high intensity. 1) what kind of inhomogenety of the iris explains the strong Rayleigh scattering? Molecules, particles, ...? 2) are there common materials with equally strong or stronger Rayleigh scattering? > Blue eyes (irises) are blue due to Rayleigh scattering of light. > However, I am not aware of other transparent media of which a thickness [quoted text clipped - 3 lines] > 2) are there common materials with equally strong or stronger Rayleigh > scattering? Blue irides are blue because, additionally, the muscle and connective fibers are blue-gray and vary in density. It is not solely about light scatter and reflection. --LB, O.D. >> Blue eyes (irises) are blue due to Rayleigh scattering of light. >> However, I am not aware of other transparent media of which a [quoted text clipped - 9 lines] > > --LB, O.D. Do you mean those muscles and connective fibers themselves are intrinsically are blue-gray? That means they contain a blue-gray pigment. What is the name of that pigment? > Do you mean those muscles and connective fibers themselves are > intrinsically are blue-gray? That means they contain a blue-gray pigment. > What is the name of that pigment? There is no blue or gray pigment. The muscles aren't visible. The "connective fibers" are cartilaginous. Fresh cartilage is bluish-white. -MT >> Do you mean those muscles and connective fibers themselves are >> intrinsically are blue-gray? That means they contain a blue-gray [quoted text clipped - 7 lines] > bluish-white. > -MT I would tend to think that if there is no blue pigment, the blue shade of a fibril is not intrinsic. Could the blue shade be due to wavelength-selective scattering in a more superficial layer, similar to the apparent blue color of veins below the skin? > I would tend to think that if there is no blue pigment, the blue shade of > a fibril is not intrinsic. Could the blue shade be due to > wavelength-selective scattering in a more superficial layer What "superficial layer?" The iris has an epithelium, but it's "clinically transparent" in blue eyes. http://www.milesresearch.com/iris/iris Iris fibroblasts are bluish, like fresh knuckle. -MT > http://www.milesresearch.com/iris/iris Sorry, the correct link is http://www.milesresearch.com/iris/ -MT >> I would tend to think that if there is no blue pigment, the blue >> shade of a fibril is not intrinsic. Could the blue shade be due to >> wavelength-selective scattering in a more superficial layer > > What "superficial layer?" The iris has an epithelium, but it's > "clinically transparent" in blue eyes. I meant a mathematical layer, not an anatomical structure. Just like milk: a thin layer appears bluish, but I would not say that milk itself is bluish. > http://www.milesresearch.com/iris/iris > > Iris fibroblasts are bluish, like fresh knuckle. > > -MT Ok. Then the question is, do bluish fibroblasts contribute more than anything else in the iris to the color of bright blue eyes? > Ok. Then the question is, do bluish fibroblasts contribute more than > anything else in the iris to the color of bright blue eyes? I think so. I don't see what else there could be. -MT > Blue eyes (irises) are blue due to Rayleigh scattering of light. Nope. > However, I am not aware of other transparent media of which a > thickness of just a few millimeters appears blue with such high intensity. Have a look at blue glass some time. > 1) what kind of inhomogenety of the iris explains the > strong Rayleigh scattering? Molecules, particles, ...? There is no Rayleigh scattering. > 2) are there common materials with equally > strong or stronger Rayleigh scattering? There is no Rayleigh scattering with blue eyes. All Hail Rod Speed, the Know-It-All a.shole of the USENET Universe. +++++++++++++ Reply to the list as I do not publish an email address to USENET. This practice has cut my spam by more than 95%. Of course, I did have to abandon a perfectly good email account... > > Blue eyes (irises) are blue due to Rayleigh scattering of light. > > Nope. Then, would you be so kind to tell what really causes the color of blue eyes, in your opinon? In addition, could you explain why Rayleigh scattering does not play a role? > Blue eyes (irises) are blue due to Rayleigh scattering of light. > However, I am not aware of other transparent media of which a thickness > of just a few millimeters appears blue with such high intensity. > 1) what kind of inhomogenety of the iris explains the strong Rayleigh > scattering? Molecules, particles, ...? I just found an article that says the blue iris is due to light scattered by stroma cells. It is not completely satisfactory: if those cells are larger than the wavelength of light, it would not really be Rayleigh scattering. http://www.wonderquest.com/eye-color.htm |
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