Welcome to the "Learning Ergonomics" video series. Repetitive strain injuries are a serious concern in the modern workplace, and this series will explore the causes and prevention of RSI through the study of position and movement. Eye strain is a major issue that can cause fatigue, headaches, and reduced productivity. This is the fourth video lesson out of seven, and it will cover causes and prevention of this common RSI. Look out for your health! Remember, a healthy workplace is a productive workplace!