[Ipg-smz] Re headaches from some phones/screens but not others...

[Daniel Dern]

This PR email from Zagg

   Subject: Reduce Digital Eye Strain While Protecting Your New iPhone
   Glass+ VisionGuard | Protect your eyes—and your phone™
   Find out more about harmful blue light and digital eye strain

makes me wonder whether this was a factor in somebody's recent post on 
"some give me headaches, some don't"

Blue-ishly,

DPD