G'morning David, 

 DW> A while later, my ladyfriend suggested that I should have laser surgery
 DW> to correct my vision, so I wouldn't need glasses - at least, for
 DW> distance. I decided to consult the surgeon who had fixed the glaucoma,
 DW> and his advice was strongly *not* to do it.

We have entrepenuers here pushing laser eye surgery, but the 
public image of outcomes does not enjoy good press;  I've not 
enquired myself 'cos mine are age-related...


 DW> He said that every laser
 DW> procedure reduces the eye's sensitivity to low light, so it can see
 DW> less well in dim conditions. People who have received several laser
 DW> surgeries often have significantly reduced sensitivity.

Interesting.  As this cataract developed, I logged the various 
effects -  despite the killing of acuity, the eye's sensations 
contributed significantly to surveillance, peripheral vision ... 
and night vision.

The thought that coherent light affects rods differently from 
cones in the retina is fascinating.

There is a third kind of sensor in the eye, recently discovered, 
that reports on general light levels and may well signal the sight 
mode - day or night vision...  I wonder if laser light affects 
these directly in some way ? 

 DW> So I still wear glasses.

Seemingly inescapable aids, dammit.  The new lens provides 
excellent long-distance vision now ... but still needs assistance 
with reading and other close work...

:-)
 
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