By the way, I'm not a doctor, and don't treat people.  I'm sure you'd get a
much more reliable answer from a good strab surgeon.

Simon Dean <sjdean@simtext.plus.com> wrote in news:51sgsfF1lvu49U1
@mid.individual.net:

If the diplopia is truly torsional, I don't think that a prism would help.  
Possibly, you might be able to use prisms to bring the eye to a
horizontal/vertical position where secondary and tertiary muscles would
resolve the torsional disparity, but it wouldn't be the same as using prism
to resolve a horizontal disparity.  I think there would be a low
probability of success, and would require alot of trial and error, in any
case.

The good news is that torsional fusion is more forgiving than vertical and
horizontal, so you don't need to get as close.

Ok,

So,

Let's say, I have a 4th Nerve Palsy which is causing a torsional
diplopia. My fusional amplitudes are pretty good and I converge the
images correctly most of the time, unless I go for those dissociation
tests such as W4D and Maddox, but every now and again in the real world,
I begin to decompensate.

Now, would any prism glasses help with the decompensation, or would
prism glasses help all the time to relieve any mental/physical strain
with having to compensate all the time (if indeed that's what Im doing)?

Am I getting a hang of these things now? Think I finally understand it.

Ta
Simon