Between the deceased eyeball's crystalline lens and

retina

A clear gel-like mass that constitutes 80% of the eye

This volume of lubricious fluid is named vitreous

humor

And can tell the toxicologist relatively when someone

died...

The unblinking eyes of the stinking corpse...

Reveal time of death of the forensic sort...

Vitreous humor so oily and viscous...

Make the stiff a posthumous eyewitness...

Hours after death, body potassium levels rise

Vitreous humor is not affected by this change

We can test the ocular fluid for an accurate PMI

The toxicologist will compare it against the normal

range...

Hypodermics filled with watery slime...

From eyeballs to test tubes, ocular grime...

Toxicologists measure potassium levels...

From the decedent's vitreous humor samples...

...Disgusting muck...

...Optic gunk...

...Punctured orb...

...Eyeball gore...

Perspicaciously evaluating the toxicologists findings

Illuminating the dead with a method so blinding

Glomming the fluid from the posterior compartment side

Determining PMI from the postmortem faculty of sight...

...The sunken eyeball... 

...Has secrets to tell...

...With its vitreous gel...