Negative impact of a long working process on visual acuity in a computer

Irrational work at the computer leads to violations of the functions of the visual analyzer, which is manifested by the development of "Computer visual syndrome". When working at a computer, such sensations can appear after 2 hours 20 %, after 4 hours 60 %, and after 6 hours-100 % of users note the presence of characteristic symptoms. Such violations cause discomfort to the user, and reduce the effectiveness of the activity performed by him.