When you have an desk work, it is important to have an ergonomic chair. Minor problems for bad sitting posture are fatigue and backaches but the worse thing that can happen to you is to injure your back. There is a field in science where they study how to sit or position yourself so you can reduce the risk of injuries.
Facts that was revealed in ergonomics studies that production can be increased if you would feel comfortable doing it.
You need different chairs for different people as they have different body shapes. This affects their ergonomic chair requirement as well.
The all time proven method to pick your ergonomic chair is to test them out.
And at the same time, you should also keep in mind a few more needs. The seat of the chair should have enough space for you to sit on while having another 1-2 inch to spare on each side of your thigh. You should be able to sit and relax all the way back without the chair's front rubbing on the back of the knee. Not to forget one of the basic rule is the chair should have enough cushioning. Tilting is optional as some users might find it more comfortable or not. The fabric used to cover the chair should also be taken note. If you are the kind that sweats a lot then you should get one with lighter material and better air flow.
After checking out the seat's comfort, next you should see if you can adjust the height with swivels or pneumatic adjustments. You must be able to seat on the chair where your thighs is slightly pointing towards the ground, knees at 90 degree or more and your feet resting on the ground. If it is using pneumatic adjustments, then you should be able to reach the control easily. Another important feature the ergonomic chair should have is to provide proper lumbar support when you seat down.
You can adjust it to the front or back, upwards or downwards. You adjust it so support can fit your back nicely.
If you are buying the chair to be used for a lot of people, then get a chair that everyone can fell comfortable in rather than yourself only. If possible, choose a chair that lets you reclineIf the ergonomic chair lets you recline, it will be an optional but good to have feature. It is because the reclining position is more natural and lift more weight of your back.