it certainly could be attributed to either of the conditions you mentioned. IT could be nothing. Or it could be more serious....possibly a benign adenoma that is growing now due to the increased test levels. Not to scare you, but visual changes are very serious.
Any associated headaches?....is it one eye or both?...night vision problems?....family history of eye problems?....the list is too long to go on.....get it checked out, even mention the roids if you have to...the more the Dr knows, the better he will be able to help you.
keep us posted please