How far away from a person is appropriate for a 52" TV show

The closer a person is to a television, the easier it is to cause eyestrain. Traditionally, people are more than 2.5 meters away from the TV, and its height should be slightly below the eye level. Watching TV, not more than 60 minutes at a time should take a break, it is best to rest with eyes closed. Some people have done research, if you watch TV for more than 4 hours without a break, you can lose two lines of vision (0.2). When watching TV, the room should maintain a certain level of brightness. The brightness of the TV and the brightness of the indoor environment can not be a huge difference, otherwise it is easy to cause eyestrain.

21-inch (54cm) color TV viewing distance should be 2.5 meters, 25-inch (64cm) viewing distance should be 3.2 meters, 29-inch (74cm) viewing distance should be 3.7 meters, 34-inch (86cm) viewing distance should be 4.3 meters.