6d1a8e9e   
   From: mathma18@gmail.com   
      
   On Apr 3, 10:32 pm, Salmon Egg  wrote:   
   > In article ,   
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   >  mathm...@gmail.com wrote:   
   > > How is ray tracing done for (colored) halos seen by glaucoma patients?   
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   > > Can it be compared to a rainbow sight? (As is known,a light ray after   
   > > refraction and TIR in each water droplet is rotated by ~ 360- 47 deg   
    approx   
   > > to produce a perceived halo in the clouds of the sky opposite the sun).   
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   > > By means of geometric optics (ray- tracing) how to show where exactly   
   > > reflection and refraction are occurring in structurally defective parts of   
   > > eye (cornea/ lens/anterior chamber/trab. mesh) to perceive such halos that   
   a   
   > > normal eye cannot see.   
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   > > It appears only open angle type produces halos and tunnel vision, so I was   
   > > curious to see a ray-trace, but had no luck in browsing internet.   
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   > > TIA   
   > > Narasimham   
   >   
   > This is not a good venue for the query. Although I certainly am not an   
   > expert on the subject, I do suffer the consequences. As I understand it,   
   > glaucoma IS NOT AN OP0TICAL problem. It is neurological and   
   > physiological. In my case, it appears to have optical problems such as   
   > scattering. I believe that to be sensory rather than actual scattering   
   > of light. The same is true for other aspects of glaucoma.   
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   > Sam   
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   Cause of glaucoma may be whatever.The final effects are definitely   
   seen or sensed after refraction, reflection etc.optical phenomena.   
      
   As the bright source draws closer, halos becomes smaller, the observed   
   proportionality to object distance suggests vision along a cone   
   angle.   
   The aqueous humor fluid exerts hydraulic pressure which changes   
   curvature of cornea and iris,at times asymmetrically distorting  them   
   as in astigmatism.   
      
   There is nothing manifest in the eye which has not been duplicated in   
   man made instrument optical instrument design,or so I imagined.   
      
   Full geometric optics exist imho, but are not yet clear to anyone, or   
   perhaps may not have been yet published. I was curious to know if   
   eye function is like a camera with simple lenses or  with curved   
   toriodal prisms or achromats etc. in diseased/ weakened conditions.   
      
   Regards   
   Narasimham   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)