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| Personal factor | Poor seating posture |
| Improper viewing distances | |
| Improper viewing angle | |
| Ocular diseases | |
| Medical diseases | |
| Ageing | |
| Environmental factor | Poor lighting |
| mbalanced of light between | |
| the computer screen and | |
| the surrounding | |
| Computer factor | Poor resolution |
| Poor contrast | |
| Glare of the display | |
| Slow refresh rate |
