Today in retail software, many people are looking at computers for an extended period. What can happen here is that after an extended period many start complaining of headaches and eyestrain.
If so here are some ideas:
-How far back the chair should be positioned depends, but as a rule, about 55 cm, but that can vary. If you notice that they often swivel their heads to focus on details, they are sitting too close.
-Enforce breaks that away from their work computer. A common mistake here is to let people sit on their work computer at lunchtime. Make them go somewhere.
-It is better for the person to look down on the computer at about 15% down, do not make them lookup. This is asking for trouble. See the above diagram. If they are too low, the only use for a telephone book today is to raise the monitor.
- People tend to position themselves in a good position for themselves unconsciously. So I would suggest giving them an office chair as it has much flexibility in positioning.
-Curved screens are better.
Now, this does not work for me, but many do claim that it does work for them. What it is that many feel that their monitor light is not natural. Studies suggest that the problem is in the quantity of blue colour emitted. This is claimed to make people's eyes tired as its light is not natural. This software Flux automatically adjusts the monitor to follow the sun's natural rhythm.
Give this a shot now and see how you go?