Answer:
What has fingers and a thumb but no hand?
The day is their night and the night is their day, when I shout and they shout back I run away.
What can you hold in your left hand but not in your right hand?
Why is 6 afraid of 7?
You'll have to consult an optometrist if you want to improve this.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?