> I also wonder, but it seems less likely, if the effect is related to defocusing of the eye, from intentionally not being in front of a screen for 3 minutes.

> I also wonder, but it seems less likely, if the effect is related to defocusing of the eye, from intentionally not being in front of a screen for 3 minutes. Unfortunately, the control group did nothing, instead of looking at something far away for 3 minutes, that is not red light. Another interesting control group could have used light at the other end of the visible range.