Answer:
I always have to work with something in my eye.
Drop me and the world will shatter. You can always find me where you empty your bladder. What am I?
I have a tongue, but cannot speak. I have a bed but cannot sleep. I have four legs but cannot walk. Yet I move as you do. What am I?
There's not a kingdom on the earth I haven't traveled over and over and though I know not whence my birth yet when I come you know my roar. I through the town do take my flight and through the fields and meadows green and whether it be day or night I neither am nor can be seen.
The more of me there is the less you see.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?