Blue light affects us in 3 significant ways, first it impacts our daily vision, it induces glare, or scarred and visual blur. A great example of this is the new LED headlights that you see on cars, this lights emit a high amount of blue light and induce a very annoying visual glare.
Second, the constant exposure to blue light, particularly in the evening hours, can disrupt our body's natural circadian rhythm.The circadian rhythm controls our sleep wake cycle, and they are very sensitive to blue light. Blue light inhibits the production of melatonin in the brain, this helps us to feel alert and energized during the daylight hours, where natural blue light it is present in the sun light.
At night, the absence of natural blue light, should lead to a production of melatonin and help us feel ready to sleep, however we now spend hours every day staring at computer screens and other sources of artificial blue lights, and we have artificial blue light in our night time environment. That can severely impact our ability to sleep, to sleep deeply and of course sleep deprivation can lead to a lot of well know issues particularly in children.
Finally exposure to blue light may lead to vision lost, as we already reviewed, it can have a contributory effect on AMD patients, but it can also impacto post-cataract patients. One of the side effects of cataract surgery, is that when we remove the patient's lens, we also remove their natural protection from blue light, which is know as the ocular lens pigment or OLP.
The science for this discussion is well documented in a number of independent articles, such as this: