[Wavytone]

Not sure how many know this - I was shown it by a fellow IISer.

In iOS10 there is a setting to apply a colour filter system-wide - which prevents being blinded by the lock screen or if you accidentally quit Sky Safari:

Settings > General > Accessibility > Display Accommodation > Colour Filter...

Turn this ON (the default is OFF) and choose deep red.

In Sky Safari, set the display to monochrome otherwise blue text will be filtered out as black.

Happy days.