Sudden Short Sightedness, and Dry Eyes, and Thyroid Problems?

I'd like to ask a question if I may.

I went to the optician the other day, and apparently my eye sight has
shifted from being slightly long sighted, to being slightly short
sighted. Is that possible?

She didn't recommend glasses at that point, just another check up in a year.

However this has got me thinking, because in the past few months, I've
just been diagnosed with subclinical hypothyroidism - an elevated TSH
and normal FT4 (of course, I do not know what my FT3 is, or if there are
any other problems, but I feel quite bad, but that's for the thyroid
newsgroup).

Anyhow, just wondered if my sudden acquisition of slight short
sightedness, might be related to the recent (within the last two months)
diagnosis/acquisition of this underactive thyroid problem?

My previous eye test incidentally was two years ago.

At the time of my eye test, and even now, my left eye (and its always
only my left eye) felt quite sore, hot, and dry. Now it sometimes feels
a little gritty. My eye doesn't appear dry, but feels dry. Viscotears
gives some momentary relief, and Im taking something called
Fuc...something Acid. These are the things I took about 3 months ago,
when I had almost exactly the same problems but with a heavy mucus
discharge. That time, my problems were cleared up within three days.
With my current problems, its been seven days with no improvement.

Now I've heard also that dry eyes can be a symptom of thyroid problems
too. Although its only one dry eye.

Any opinions on the short sightedness issue, with any possible relation
to hypothyroidism? Or the dry eyes that now aren't getting better even
with treatment?

Cheers
Simon