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What is the recommended viewing distance for televisions? - SONY
The recommended minimum viewing distance for a 4K TV is 1.5 times the TV's vertical screen size. At this distance, individual pixels cannot be differentiated by the naked eye.Recommended distance for viewing High Definition TV is 3 times of the TV vertical screen size.
Recommended distance for viewing Standard Definition TV is 6 times of the TV vertical screen size.
- For sports, gaming, and everyday viewing, the screen should ideally fill 30° of your field of vision.
- For a more cinematic experience, you may prefer to sit closer, allowing the screen to fill 40° of your field of vision.
Detailed tables for screen size & room distance in the link below:
TV Size to Distance Calculator and Science - RTINGS

TV filling 20 degrees of the field of vision

TV filling 30 degrees of the field of vision
Bigger and closer is usually better when it comes to choosing the perfect television for your room. Size not only affects the price of a television, but it also has a huge impact on the perceived picture quality. Use our size to distance calculator to see which size TV you should get based on how far away you'll be sitting from the screen.
Since resolutions found today are almost exclusively 4k (Ultra HD), it takes a very big TV watched from very close to see imperfections related to the resolution. Because of this, you can sit closer to your TV than you would with lower resolutions and have a more immersive experience.
Think of it like a movie theater: the more a TV fills your view, the more immersive it will feel.
That doesn't mean you should be sitting a foot away from your TV. Having the largest screen possible isn't always ideal. The human visual system has a total horizontal field of view of about 200 degrees, although a portion of that is peripheral vision.
While it makes some sense to get as large a TV as you can for movies, not all content is made to fill the entire field of view. This becomes very apparent if you try to watch sports from up close while fixating on a single part of the screen, which quickly starts to feel nauseating.
Link to article with more info below:

TV Size To Distance Calculator (And The Science Behind It)
Choosing a new TV for your room can be a daunting challenge. The market has never been more complicated, with dozens of new models released each year and a mountain of marketing jargon to work through.
