In my downward gaze, covering and uncovering my eye, I see, for example:

/\

ie, looking at my keyboard now, in the left eye, the keyboard slopes up
to the right.

Right eye, keyboard slopes down from the left.

With my right eye covered, in my straight ahead gaze, my computer screen
appears down and to the right (compared to my right eye) and slopes
downwards. vertical lines appear to skew off to the right...

and even more worryingly now, my colour vision in my left eye appears to
be slightly different to my right eye. Either my left eye is greyer, or
my right eye is yellower.

Er...

Im getting a bit freaked out now.

Cya
Simon

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