G'morning David, 

 DW> For ten years or so, I wore contact lenses, and had one eye corrected
 DW> for distance and the other for close-up. After a bit of practice, my
 DW> brain got used to this situation, and I could see perfectly clearly at
 DW> both distances. I have heard of the same idea being used with laser
 DW> surgery, so even an older patient can see both distance and close-up
 DW> without glasses or contacts.

Yea for the brain!  I was fascinated to track the degree to which 
my failing right eye nevertheless contributed significant info to 
overall perception....   especially with autostereograms.

 DW> However, there is a problem with middle-distance. This is one of the
 DW> reasons why I now wear graduated-focal glasses.

Me, too.  When they reformulate them for the new eye-lens,  I will 
again see how well the current phototropic materials have advanced 
and perhaps include them...  I ain't convinced that sun exposure 
didn't contribute somehow to the cataract growth.

:-))
 
___ MultiMail/MS-DOS v0.45

--- Maximus/2 3.01