Asthenopia is when your eyes feel very tired and uncomfortable after you have been looking at something for a long time. This can happen when you are reading, watching TV, or using the computer. Your eyes may feel like they are burning or itching, or they may become blurry.
Think about how sometimes when you run around and play outside, you start to feel tired and need to take a break. This is the same thing that can happen to your eyes! When you look at something for too long without resting your eyes, they can get tired and need a break too.
The good news is that asthenopia can often be avoided by taking regular breaks from whatever it is you are doing. This means taking a few minutes to rest your eyes, look away from the screen or book, and focus on something else like a tree or the sky. You can also try adjusting the lighting in the room, blinking more often, or using eye drops to help keep your eyes moist. Remember, taking care of your eyes is important to keep them healthy and happy!