The answer is right to some extent. There are five disadvantages of over-time using computer.
First, the computer radiation will do harms to your eyes and induce some eye diseases like glaucoma, etc.
Second, computer microwave like low-energy X-ray and ELF emission are easy to cause the disorder of human's central nervous system. In this situation, your eye may feel itchy and tired.
Third, if you often use computer over-time, the frequent movement of eye and fingers will lead to heavy burden on your mind and physiology.
Forth, it will lead to the net synthesis.
Fifth, the toxic gases that computer eliminates may be bad for respiratory system. For these situations, control the time of using computers and never let the time more than 10 hours. Rest your eyes for 10-15 minutes per 2 hours. It's a good choice to look into the distant green trees and plants, which may help eye accommodation. Besides, massage round the eyes' chakra in turn or stick hot/cold compress on your eyes to relieve the eye stresses.
Last, guarantee enough sleeps in night and try not to stay up. If your condition is allowed, try to eat fresh green vegetables and intake various kinds of vitamins.