[Unit]
Description=Iris Eye Protection Software 
After=lightdm.service

[Service]
  Type=oneshot
  Environment=DISPLAY=:0
  User=your_username
  ExecStart=/bin/bash -c 'DISPLAY=:0 xhost 127.0.0.1 && /opt/iris/Iris.sh'
  KillSignal=SIGINT
  Restart=on-failure
  RestartSec=2

[Install]
  WantedBy=multi-user.target