Well, the brain
is well capable of blending out the reflections and it gets alot of help from the eyes when doing so. That is simply because of the fact that reflections need to be focused
behind the screen while the screen-image needs to be focused
on the screen.
On the other hand this "work" can lead to both eye strain and brain strain aka getting tired sooner.
That is because:
- Everytime the reflection is moving (like someone passing by) your eyes/brain will recognize the movement, become distracted for a short time until they realize that the movement is "no danger" and then need to concentrate on the screen-image again.
- Blending distraction out is an "active process" on part of the brain. While the senses (eyes, ears, skin-nerves) easily adapt to the overal level of sensation (bright street light vs dark living room ambience, loud street noise vs quiet library) the brain still get's alot of informations that have to be filtered out. That can be quite exhausting by time.
- Many people tend to "stare down" the screen when trying hard to concentrate to onscreen informations vs reflections informations. Because of that they forget to regulary bat their eyelashes leading to dry and hurting eyes (feeling tired again).
- Most enviromental lightings are setup wrong. The ceiling lamps use to be in the center of the room while the screen is standing at a wall. There is more light coming from behind the user than coming from behind the screen. While you need to turn up the screen's brightness to compensate for reflections the contrast to the darker wall/surrounding gets bigger.
Everytime you turn your eyes from the screen to look at something in your room (like a piece of paper on your desk) your eyes have to adapt to the mostly darker lights (takes minutes). Everytime you turn your eyes back to the screen your eyes have to adapt to the brighter screen (takes seconds) while the surrounding of the screen is blended off into dark contrast again.
Weird science...