If you look up thyroid eye disease (TED), thyroid ophthalmopathy, or Graves' ophthalmopathy, it will give you a lot of information. I believe most eye problems are Graves related, but Hashi's can have some as well. I haven't found anything specific on retinal problems, they mostly talk about corneal or optic nerve symptoms, or the muscle behind the eye changing and causing a *bulging* eye look.
<-- if you find yourself looking like that a lot, see your doc. LOL!
I think by far the most common problem is dry eyes, however, which is so common anyway, for a variety of reasons (looking at computer screens too long, dry air, etc.) My doc recommended a sterile eye drop if I feel I need it.