Researchers from Cambridge and Meta Reality Labs have experimentally determined the limit of human eye resolution, concluding that most people cannot distinguish between 4K and 8K at a distance of approximately 2.5 meters from a 44-inch screen. The study found that the human eye can differentiate around 94 pixels per degree (PPD) for black and white images and 89 PPD for red and green colors. However, for yellow and purple colors, the PPD drops to 53. This means that even if a television is physically capable of displaying more details, the brain may not be able to distinguish them. The researchers have created an online calculator to determine whether it is worth upgrading a television based on the size of the room and the resolution of the screen. According to Professor Raf Manteika, increasing the number of pixels becomes meaningless when technology exceeds the physiological capabilities of vision. Meta has been recognized as an extremist organization in Russia.