Though we have several advantages in using the computers, there are some disadvantages too. It comes in the case of our health. There are many surveys saying that, using the computers for a long time will affect your eyes. Don’t worry there are some preventive measures are also available. It is called as 20-20 principle by the doctors. Every 20 minutes while using the computer you should see some objects at the distance of 20 meters for just 20 seconds. This will reduce the stress produced on your eyes.