The computer is a tool type. Humans have tried to invent to save labor and reduce operating within them. So we should know how to use a computer properly and safely. Starting from the light from the computer we can be tailored to the eyes. How to adjust without restriction. Only provide light to our eyes feel comfortable and is used to screen on the screen to reduce the intensity of the light. To prevent eye fatigue and muscle pain or burning eyes, should sit in the proper. And away from the computer screen around and do not have the dust screen should be clean.