Neil:

Gabapentin is famous for side effects. It is effective in the control
of neuropathic pain, specifically successful in treating trigeminal
neuralgia, shingles and herpatic syndromes

When you look in PDR and other such rescources, it is difficult to find
cites about specific visual abnormailities. Most commonly they will
list it under "Special Senses" and/or "Other" and call it "Abnormal
Vision" or "Vision Changes" with percentages of frequency of
occurrence.

There are numerous off-label uses, and this IMO is dangerous. One side
effect is suicidal ideations which tend to persist post administration.
There was a big settlement earlier. May I ask what your side effects
were?

The best thing to do is a focused search on the drugs, say using
"Gabapentin side effects" or the like. Digging down, you'll find
academic and/or medical monographs which detail these adverse effects,
but they are not expressed in lay terms.