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There is a myth that eyestrain can result from watching TV in a dark room, because the eyes adjust to the darkness of the room by expanding the irises, to let in more light, and then the brightness of the TV is excessive. I have found no evidence that this is true. It is possible to get eyestrain from watching TV, only because your eyes remain fixed at the same focal distance for long periods of time, but this phenomenon has nothing to do with the brightness or darkness of the room or of the TV. Personally, I watch TV in a dark room and it does me no harm.

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Q: Why should you not watch TVs in a dark room?
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