Vision after cataract surgery

At age 60 I had to use reading glasses. I am now 82 years old and due
to clouding I had cataract surgery. I selected monovision, simply
because that's what I had for the last two years. For reasons unknown
to me one day I was able to read newspapers withouth glasses. My right
eye stayed at far focal range and my left eye changed to close. I am
perfectly happy with the replacement lenses, but as an engineer I am
very unhappy that I have not the faintest clue why the brain is able to
seamlessly switch from one eye to the other when the viewing distance
changes. My eye surgeon hates engineers, he thinks they are like kids,
they allways have to ask: WHY. Anybody knows WHY ?

The second problem I have is: When I look at say 3 televison antenna
towers in the distance, they are not straight up and parallel to each
other, but they are slightly bent in relation to each other. The
windows in a large building are not rectangular but have a hourglass
contour in the vertical, with top and bottom at slightly different
angles. While this does not bother me much it again brings up the WHY.
If the lens used was a fresnel I could consider some kind of
interference, but I am assured the lenses used are of the lenticular
design, i.e. slightly thicker in the center than at the rim. Again,
anybody knows of this?

Richard

> If interested, try signing out some perceptual
> psychology books from your local library. Steven Pinker and Oliver
> Saks have some interesting and readible books.
>
> If you want more detail on the how, you will be deep into neuro
> physiology and the electrical and chemical properties of brain cells.

And Richard, if you do run across how the brain patches in the crazy quilt
design into the blind spot....
please let me know.
: )

Don W.