I have discovered that with iOS 11, one can go to Settings/General/Accessibility/Display Accommodations and turn Colour Filters On. Using the Colour Tint option, one can turn the whole device red and thus have Night Vision across all apps without resorting to Rubylith.
Sky Safari menus and other things that are normally blue become much more visible if you select Night Vision in the app as well.
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Robert Nielsen I use this technique in a pinch ... I even have the "tap three times quickly on the home button" to invoke the all red mode.
But I still think Rubylith with night vision mode and the brightness turned 80% down is the best on my night vision and easiest to see (especially reading text).
Robert
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Keiron Smith Thanks sharing your iOS night vision hacks! Excellent!
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