Just went to the optometrist for the annual exam. They recently got a new machine in back that takes a photograph of the back of your eyeballs, allowing the doc to take a more thorough look at things without burning holes through your retinas if he did it live.
I snapped a couple photos of the monitor after the scan. The second shot is the back of my right eyeball as seen through my pupil.
Call me weak, but the sight of those all those nerves and vessels and capillaries made me cross my knees and instinctively grab my testicles.