I think Kohberger concocted claims of visual snow to discuss his absence of emotional connection with others. He claims that
fuzzy vision means that others are
video game people rather than real people. That's absurd.
The below comments are attributed to Kohberger. He seems to be using a symptom that is often associated with migraine to describe his absence of emotional connection to others; to objectify them and portray them as two dimensional people.
Visual snow and ocular migraine (also known by other names) is a temporary visual disturbance (typically lasting 20 minutes, followed by head pain) that interferes with reading, driving, doing anything that relies on vision. I have personal experience with this after a concussion. It is a type of migraine that has absolutely nothing to do with perceptions of others.
I think that Kohberger wanted to discuss his absence of emotion, and used visual perception as a spring-board. He's trying to be clever by camouflaging his sociopathic tendencies as a visual barrier.
"The man charged with the stabbing deaths of four University of Idaho students has spent much of his teen and adult life consumed by a rare neurological disorder known as visual snow syndrome.
...
Looking into the faces of family members was like “looking at a video game, but less.”
“As my family group hugs and celebrates, I am stuck in this void of nothing, feeling completely no emotion, feeling nothing,” the post said. “I feel dirty, like there is dirt inside of my head, my mind, I am always dizzy and confused. I feel no self worth.”