Shocks sis and all — there is literally a passage in the Bible about the darkened eyes. So this is a very old and natural and acknowledged aspect, although in current time I suspect it also likely indicates substance abuse.
I was astounded when I discovered that passage last week. When I find it again, I will post it here for you.
No questions from me today, just stopping by to say that about the Bible passage and to welcome you to your new thread.