I've had dry eye for an esitmated 3-4 years. It came on very gradually
so it's hard to really pinpoint when the condition began. While
struggling to get the condition diagnosed, I kept a log of eye issues
including pain levels and environmental factors. One thing I noticed
was that my eyes always felt terrible on rainy days. No amount of OTC
eyedrops offered relief.

This seems counter-intuitive. I would think that the increased humidity
on rainy days would actually help.

I've been using Restasis for about 3 months and have experienced a
moderate level of improvement. However, today, in my corner of the
world, it is raining and my eyes feel terrible (very scratchy, as if
sand paper had been applied to the surface). I tried to soothe my eyes
with OTC eyedrops and they don't make a difference.

Any theories?