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Visual discomfort is another aspect that is very important. This is most experienced by many computer users and the symptoms include dry, tired eyes or difficulty focusing. Visual discomfort is also called eye strain and it is a much more common discomfort and can result to reduced performance and increased errors, and workers often adopt awkward postures in an attempt to avoid glare or other causes of eye strain. Glare can result from a window that have no blinds or drapes hence the sun shinning into the room glares from the computer screens. This brings considerable amount of discomfort to people and slows them down in that people may adopt the habit of printing out their work to check for errors since they find it easier to proofread from hard copy than from their computer displays. This may cause eyestrains, headaches and sometimes leading to people missing work.

Itchy and dry eyes are common due to computer glare, especially among those people who use contact lenses. People tend to blink one-fifth as much when looking at a computer monitor when compared with reading from a paper. This combined with the low humidity levels of humidity in many offices, lead to dry eyes and irritation. This can be reduced by lowering the monitor of the computer so that one is looking slightly down in order to promote blinking. Also ensuring that exhaust fans from equipment and from the building's ventilation system are not blowing straight into people is key to reducing this discomfort.

Human eyes are adapted for distance vision and they are more relaxed when one is staring off into space. Office work be it reading from papers or computers is done relatively close to the eyes and can cause strain because small muscles within the eyes have to work to turn the eyes inward and change the shape of the lenses to focus for near vision. Symptoms of tired, sore eyes, the same way the muscle of the back feels when seated long in the same position, are experienced when these muscles fatigue.

The human eye has a tendency to turn inwards and focus for near vision when one looks down or changes his visual angle downwards. This is because objects that are lower in your field of vision tend to be closer to you and the opposite is true, of looking straight ahead and upwards where the eyes tend to turn outwards and focus at a distance. In this case, one has to work harder to focus on close objects with the head in that very position. This explains why almost every one tends to hold a book, a newspaper or any reading material, below eye level when reading from them. Reading from a monitor or documents located at the eye level or higher can contribute to eye strain. As much as having the monitor close or too high can increase the chances of having eye strain, having it too low or too far away can result in awkward postures as one has to lean forward to view it. The further away one can place the monitor the better as long as he is comfortable when reading the本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。