Light sensitivity is because of dry eyes. Try using glasses with Antireflective coating if you're not using one. Try using an eyedrop like Soha or Maxmoist that can retain for a longer period in the eye. Follow 20-20 rule while working on laptop or using mobile which means that after every 20 mins of screen time take a break of 20 secs by changing your focus to something kept at a faraway distance.