When one posts a comment, one is able to edit it during a brief grace period. Moderators can edit any comment at any time.
A comment that has been edited will have a little pencil symbol:
Moderators can view the revision history of a comment by clicking the pencil. It looks like this:
What I'm requesting in this post is for this revision history to also be accessible to the author of the comment, as well as to mods.
While comment edits by moderators are uncommon, and we trust moderators to use this ability responsibly, it seems reasonable that the original owner would be able to see edits to their own comment.