Hot answers tagged


The reason is that LED lights typically pulse rather than give continuos light. This can be because of flickering due to converting AC power into DC, but also dimmer or driver circuits regulating how bright they are by only keeping them lit for a fraction of time (but, in high quality systems, flickering is so fast viewers will not notice). When you move the ...


The reason is probably that the focal point of the red light is different from that of the blue, because the lenses exhibit a nontrivial amount of dispersion. This is a common problem with cheap plastic eyeglass lenses, and to avoid it you must specify low-dispersion lens material.


I think to answer your question you have to think about how the eye works. Light reflects off of an object and strikes the back of the eye to trigger the individual sensors that detect light. When you move your eyelid over your eye there is no light striking the light sensor in the back of your eye and the brain doesnt make any adjustments.

Only top voted, non community-wiki answers of a minimum length are eligible