You focus on your computer screen with split levels of on screen awareness, viewed with inner surroundings on your screen (different focuses inside your viewing) computers drawing in thoughts 'into' the screen (with further inner focus on your on screen activities) while at same time viewing a somewhat unnatural light, while focusing inwards.
Distancing between the screen and surrounding space, focus acuity being 'through screen', further into the space which forms distance to some level away from surroundings, which is further leveled with your thoughts and consciously 'aiming' your focus, with subconscious often being your surrounding space, your environment, depending on how focused you are on your on screen activity (which this may be to such a large extent, that it actually becomes not recognisable) an inner plateau that levels a social distance - that may be caused by viewing this form of unnatural light itself while at complete focus on screen.
Levels of attention may be affected and in this may not be noticeable as well. Your attention to your on screen activities may actually depersonalise other parts of your social life.
We thrive off natural light, we grow, so unnatural light may hold connectivity to some extents as well. Screens and monitors overtime can hurt your eyes - it tends to show a level of somewhat visual perspective issues when used for long hours, a strain that literally seems to disconnect perspective or alter focus.
Long term computer use may affect ability to socially thought target (recognition and furthered understanding of individuals actions and behaviour - [thought targeting] - reading someone's thoughts to certain extents - nerve reactions, movements, fear) - most do not recognise to this level, many do 'gain the understanding' without ability to directly recognise all factors, an underlying instinctual awareness that lets us have ability to communicate, there also may be some truth to helping with language barriers and language interpretation.
Thoughts are simply highly transparent but even if the individual 'grasps' they may fail to reacquire, to understand the entirety. - a level of apparent technological interference into cognitive registry - a technological 'blindness' that exists in a highly non-recognisable state.
Will long term computer use damage humanity's cognition ? I should be saying right here; 'it does and will', but... it is not that simple. The damage itself may actually also hold value over some positive traits as well, a sickness for use of a better word, that can actually weaken and in doing so produce sporadic or further formed awareness, it may improve connectivity in some area's, and diminish it in others.
Long term damage will be hard to tell, apart from certain weakened accuracies. It may still damage humanity as a whole. Sustainability of 'a weakened mental height' is not possible, we may even in future have a serious situation of people feeling flat and fatigued and even perhaps lucid with thought connectivity (though this will not be helped at all by medications which might span generations) In this being lucid itself may be seen as being accurate as the issues will be socially revolving and hence may create a direct blind spot in this.
There obviously does need to be an institute set up to monitor 'general population's' thought acuity if is not such a department already. It is certainly needed when we constantly breathe in all sorts of chemicals which may not be harmful at all 'for now' , though long term it will most likely cause many issues including creation of diseases -if has not been the case for pollutants as is already, or is in process of forming long term health based issues, including by long term the population viewing screens.