Yes, it probably is thyroid-related. I have it, too. Besides that, on some days, my distance vision is very blurry. At first I thought I just need a new eyeglass Rx, but it only happens occasionally. Also... dry, gritty-feeling eyes are part of the deal.
Anyway, if you search using the term "thyroid + 'photophobia'" [medical term for light sensitivity] you'll find many references to it. Most often it's associated with Graves', but at least part of the time, it's associated with Hashi's.
[This message has been edited by midwest1 (edited 08-18-2003).]
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"We can complain because rose bushes have thorns, or rejoice because thorn bushes have roses." Abraham Lincoln
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light sensitivity 
