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Useful tips

Computer screen should be positioned approximately 15 degrees below eye level.
Get a good chair to sit on. Back should be straight and shoulders back but relaxed.
Upper arms are close to the body and relaxed. This will prevent muscle strain.
Forearms are flat on the desk, with the elbows forming at least a 90-degree angle.
There must be regular breaks. Your eyes should rest every 20 minutes. This will reduce the risk of focusing fatigue and will release eye strain.