person A: I went to the optometrist_comma_ and my prescription got strong. She warned me about being at risk for losing my vision.
person B: That's not good. I know my eyes hurt when staring at the bright white screen on computers . So I change them to a darker color when possible.
person A: Oh yes. That is smart. After the warning_comma_ I use the screen dimming program called f.lux.
person B: Haven't tried that yet_comma_ but I have heard of it. I will check it out. thanks !