These are my eyeballs, not to scale. The eyeball on the left is the one with glaucoma (you can see through the pupil) while the eyeball on the right is a normal eyeball. You can see the veins and nerve coming out of the back. The one thing you cannot do with this is feel them. Glaucoma causes pressure inside the eyeball, so the eyeball on the left is harder than the one on the right.
On a side note, I’d be happy to mail these up there so you can play around with them.