Monster: The Ed Gein Story uses the color green as a visual metaphor for Ed Gein’s distorted, delusional view of reality and his idea that the people he harms are “poisoned” or contaminated, not as a literal medical condition like colorblindness.

What “seeing green” means

In episode 4, titled “Green,” everyday things—blood, tea, headlights, even his underwear—start appearing green from Ed’s perspective. This isn’t meant to be realistic vision, but a stylized way to put viewers inside his unraveling mind and show how far removed he is from normal moral perception.

Symbolism of the color green

Articles breaking down the episode explain that Ed’s mother tells him Bernice has an STI, and he begins to see her blood as “poisoned.” The green color represents how he rationalizes his crimes: in his twisted logic, killing is framed as “purifying” someone whose blood he believes is contaminated. More broadly, commentary on the series treats the green filter as a symbol of moral decay, rot, and a toxic worldview rather than safety or calm.

Not a real-life symptom

There is no evidence that the historical Ed Gein literally saw the world as green or had a specific green-tinted visual disorder. The “seeing green” idea comes from the Netflix-style dramatization and fan discussions, where the color is used to visualize psychosis, delusion, and his disturbed inner life, not to document an actual clinical symptom.

TL;DR: In Monster: The Ed Gein Story, Ed “seeing green” is a creative, symbolic choice to show his delusions, sense of “poisoned” blood, and moral rot—not a factual trait of the real Ed Gein’s eyesight.

Information gathered from public forums or data available on the internet and portrayed here.