Similar to ultraviolet rays, blue light is on the light spectrum with the highest wavelength and highest energy form. While it definitely has its benefits, it also has its set of drawbacks that can be extremely damaging.
The human eye has no in-built feature to filter out or block blue light. Although fairly good at protecting the sensitive parts of the eye from ultraviolet rays, the eye is incapable of forming any kind of protective layer of filtration for blue light. As a result, blue light easily passes through the layers of the eye and directly hits the retina.
Blue light’s ability to directly penetrate the eye can cause degeneration of the retina in a way similar to macular degeneration (the central part of the retina). It can cause major vision loss, and increase the risk of developing MD later in life. Blue light also causes a lot of strain on the eye muscles, because of how easily it scatters and increases the amount of strain needed to focus.