How to enable grayscale for visual accessibility on your iPhone or iPad

[iMore.com]

Grayscale mode is a new accessibility feature available in iOS 8 that allows folks with a visual impairment, such as color blindness, disable colors that make the display even harder for them to see. Since some colors are harder to pick out than others for people that are color blind, grayscale mode may make reading menus and viewing images more detailed.

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