There is a distinction between ultra-high definition (UHD) TVs and 4K resolution, with some outlets suggesting that not all UHD TVs may technically be 4K. Scientists have reportedly measured the resolution limit of the human eye, leading some to question the value of ultra-HD TVs for typical viewers. The discussion around 4K resolution and UHD TVs is ongoing, with various outlets offering guides on buying the best TV and streaming in 4K.