Visual Illusions: Why You See Things That Aren't There

The video explores entoptic phenomena, where the brain misinterprets signals, causing visual effects like flickering lights. It discusses historical experiments by Isaac Newton and explains how rod cells in the retina detect light using rhodopsin. The video also covers how thermal energy can activate rod cells, leading to the perception of Eigengrau in darkness. It explains pressure-induced phosphines and how sensory deprivation can cause visual effects like prisoner's cinema. The video emphasizes that these phenomena are not full hallucinations but tricks of perception.

How can pressure applied to the eyes lead to the perception of light?

What is the phenomenon of 'prisoner's cinema' and what causes it?