cf72ac56   
   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?   
   >   
   > > 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.   
   > --   
   > Sam   
      
   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,   
   proportionality to object distance suggests vision along a cone angle.   
   The aquous 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 instruments.   
      
   Full geometric optics exist imho, but are not yet clear to anyone, or   
   may be not yet published.   
      
   I have posted here with a hope that if the cause is known treatment of   
   glaucoma can deal with causes rather than management of its effects.   
      
   Regards   
      
   Narasimham   
      
   --- SoupGate-Win32 v1.05   
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