I got my new temporary glasses today, with a prism in the left good
eye and about 3D stronger Rx in the bad right eye.  It certainly
improved my vision in the right eye alone, though with considerable
distortion that apparently cannot be corrected, due to scars on my
macula and retina from my recent macular hole and retinal detachment.
But the two eyes combined vision was uncomfortable and overwhelming,
to say the least, although I could see details.  The optician
(apparently the store owner or manager) told me that it would take
some time fo adjust to the new glasses and advised me to go home and
get used to them.

Actually, I got 2 pairs -- one for driving and the other for computer
and indoors use, 1.25D weaker than my driving Rx.  I decided to start
with the indoors pair and wore them for a couple of hours.  Indeed, my
vision "stabilized" and became more comfortable after about 30
minutes.  But then...

I suddenly felt a severe pressure pain in the lower right and left
back of my head.  I canoot recall ever having headache in that
location, and it was scary.  The headache seemed to increase as the
time went by.

I called the optician, who advised me to remove the glasses and start
again tomorrow.  I ased to speak with the optometrist, but he was with
a client.  I left my number and asked that he call me back, but he
didn't.

I followed the advice, removed the new glasses, put on the old ones
and got off the computer.  First I saw double and had difficulties
focusing, but this disappeared within a few minutes.  Most
importantly, the headache diminished almost immediately, and now (3
hours later) it's gone.  This may be a convincing indication that the
headache was caused by the new glasses.

What should I do next?  Should I try again tomorrow?  Is it safe?
Apparently my new glasses, by improving my bad eye vision and
decreasing the disparity between my 2 eyes, caused my brain to process
the information from the bad eye which it had probably ignored in the
past 4 months since my retinal detachment surgery.  But why should it
cause headache?

I feel that this experience is beneficial before going through a
cataract surgery in the bad eye.  Now at least I have a choice, which
I will not have if the IOL implant doesn't work properly for me.  I
also found out the best vision I can anticipate from the bad eye with
the proper Rx, although I presume the cat removal will improve it
somewhat, but not significantly.