It’s just a red dot telling you it’s time to get off your phone. I’m just kidding. I can’t exactly remember the name of what it’s called. And dooont tell me in the comments. But it’s just when ur phone is in the dark and it is basically telling you to turn up ur brightness cause it’s bad lighting. BuUuUuUut. U don’t have to cause I’m pretty sure it’s just another one of thoes lil myths parents tell u so u don’t “hurt” your eyes. I mean! I can just eat some carrots and make them all better! Just give up all ready!