Since reading this thread few days ago, I've noticed I do something when I'm sewing. When machine sewing with reading glasses over my contacts, my face is very close and my eyes are working hard to focus on such a little spot. When I take off the glasses, I don't look up at the room right away. I look at something just a few feet away and let my eyes adjust for a second or two. Then when I look across the room, my eyes don't go berserk trying to distance focus.
I've had lots of eye problems through life. Glasses starting at age 4 and a lazy/wandering eye. I went through lots of eye therapy as a child. The vision is still pretty bad in that eye, but at least it doesn't move all around. Two-eye depth perception is pretty much non-existent for me, but somehow I have figured out how to compensate for most things. So, I thank God for the vision I do have, especially since I work my eyes as hard as I do with quilting, reading, driving, computering, etc., ....