They don't pierce eyeballs.
It is called a nose piercing.
The eyeball on an above-ground pool is a return jet fitting that directs water flow, improving circulation and chemical distribution.
Exophthalmos
sclera
it's called a bridge piercing
An eyebrow piercing...
back eye
The Iris.
sclera
Sclera
intraocular fluid
Yes, the outer covering of the eyeball is called the cornea. It is a transparent, dome-shaped layer that helps to focus light into the eye.