What makes your eyes irritable to lights?

2018-05-16 17:09:54

I was just wondering why my eyes become irritable to lights like LED, fluorescent,etc. after watching a video in my smart phone for about 20 minutes. The lights seem to be too shiny or glittery to my eyes. Should I reduce brightness or increase it in my smart phone?

Are fluorescent better than LEDs for good eye health?