.it's safe if the child undergoes learning online via a gadget or computer. He advised parents to intensely check the eye health condition of their children, especially whether the child has a minus. "You don't need to wear radiation glasses, what makes you tired is the time, too long in front of a gadget or computer screen makes your eyes tired," he explained. When using a gadget or computer, Dr. Ferdiriva suggests taking a break or resting time for approximately 15 minutes. Routinely done after 2 hours in front of the gadget. "Every 2 hours, rest 15 minutes," ordered Dr. Ferdiriva. Furthermore, according to him, it is not radiation that harms children when learning online through gadgets, but how close the children are to the gadget screen and how much time they spend in front of their gadget screen. Here's how to safely use gadgets so that your eyes don't get damaged or tired. - Give your eyes a break when using gadgets - Make sure the screen of the cellphone or computer gadget is not too bright and not too dark - Every 20 minutes in front of the gadget screen, rest your eyes for 20 seconds by looking away from the object's screen that is at least 20 feet or six meters from where you stare at the gadget screen.