Lighting Research Center, Rensselaer Polytechnic Institute. It is best to read with light shining directly onto the page. That’s not true either, but reading in dim light can cause eyestrain or give you a headache.
EYES IN THE DARK TV
However, kids who habitually sit close to the TV may be indicating that they can’t see the screen clearly if they sit farther away, possibly suggesting a need for glasses.Īnother myth holds that reading in dim light can hurt your eyes. You might be interested to know that another persistent notion – that sitting too close to the television will hurt children’s eyes – is also not true.
Any temporary eyestrain that results from watching their screens in the dark pales in comparison to the damage they could be doing by interfering with healthy sleep. One 2019 analysis of more than 6,600 adolescents showed that those who looked at mobile screens within an hour of sleep got less sleep, and of poorer quality, than those who didn’t – and the effects were considerably worse in those who had watched their screens in dark rooms compared with those who had watched in lighted rooms. I am more concerned about the health effects of looking at cell phones and other handheld devices late into the night, which has been shown to disrupt sleep and negatively affect overall health. All told, the results could be interpreted as mildly critical of watching television in a dark room, but no real harm was found.Ĭurrent research is looking into the effects of high-definition televisions and 3D televisions on the eyes so far there has been no evidence of lasting harm from those, either. But the only statistically significant differences were due to trouble focusing, sleepiness, and the time lapse between the onset of the visual cues test and electrophysiological brain responses.
EYES IN THE DARK MOVIE
The result of all this testing and observation was that there was less eyestrain, discomfort, and visual fatigue when the volunteers watched the movie against a lighted wall. They also asked the participants to assess how the surrounding level of light affected them. And while the participants were watching the movie, the researchers monitored the rate at which they blinked their eyes. Another group of participants did the same thing, but in reverse order – first in the dark environment and then in the illuminated one.īefore and after watching the movie footage, all of the participants were asked to respond to visual cues by pressing a button, an exercise that allowed the researchers to monitor the participants’ electrical brain activity and note any changes that occurred between the beginning and end of each session. They then took a break and later watched another hour of movie footage without wall illumination. Half of the volunteers viewed the movie in a room where the walls surrounding the television were illuminated.
In a 2006 study, researchers from the Lighting Research Center (LRC), part of Rensselaer Polytechnic Institute, asked some volunteers to watch an hour of an action movie on a flat-screen TV.
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