Most chairs are designed for people of average height. At this time in history, that means somewhere between 5’ 6” and 5’ 10”. That said all of the chairs on the above list are fully adjustable for height. Many will also allow you to tilt the seat forward or backward and others have seat backs that can be adjusted to please your particular physiology. So the notion that you may have some sort of problem establishing a comfortable relationship between yourself and the monitor if you are either shorter or taller than average is a bit over the top.\r