i need a LCD monitor at my work.
Refresh rate of 60 Hz. Resolution set to the native resolution of the monitor. The brightness you need to adjust to a level that is comfortable for you in the place the monitor is. For contrast, you generally want this as high as possible. If the brightness range does not adjust low enough, then reducing the contrast will help. But take the brightness all the way down first. Probably more important is to give your eyes a rest every few minutes, and get up an move around every hour or so. Sitting and staring at a screen you tend to not blink enough and your eyes can dry out. The eye muscles get strained when you focus at one distance all the time, and you body gets stiff becasue you do not move enough.
