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Display and Text Size settings can now be adjusted on a per-app basis in iOS 15. Go to Settings > Accessibility and select Per App Settings.
Text size adjustments can also be made in Settings > Display & Brightness > Text Size, however the larger accessibility sized options are only available from the accessibility settings area.
Display scaling makes everything on the screen look bigger but can make less information available on the screen requiring more scrolling. Using the Zoomed view requires a restart.
Increased contrast slightly increases the contrast of text and user interface elements such as toggle, and icons to make them easier to see and read.
Dark mode replaces the standard light background & dark text system theme with a dark background light text theme which can make text easier to read for some individuals and may reduce eyestrain.
Night Light reduces the blue light emitted from the computer screen. Reducing blue light may reduce eye strain when used in dimly lit or dark settings.
Smart Invert reverses the colors of the display. It can make light displays dark and dark displays light without affecting images, media and some apps with dark styles.
Several manufacturers make hearing aids that work with Apple's made for iPhones (MFi) certification. These devices let you stream audio, music and phone calls directly to your hearing aid.
Add Live Listen to the Control Center:
Turn on Live Listen
Mono audio may improve the listening experience for individuals who have significantly better hearing in one ear by combining the left and right audio channels into one channel.
The closed captions settings provide several options for displaying captions for individuals who are deaf or hard of hearing. Captions can also be useful for people in noisy environments or who otherwise have difficulty listening. Options include adjusting the color, size, style and presentation of the caption text and its background.
Voice control is designed for people who need assistance operating the computer by voice and requires some training to use effectively. Use dictation instead for more limited assistance with typing.
AssistiveTouch provides a menu of options including volume adjustments, multi-finger gestures, home, and more that can be operated using a single tap rather than complex gestures.
Touch Accommodations adjusts how the device responds to taps and other gestures making these easier to use for people with more limited dexterity.
Only available with an external mouse. See Tips & Notes.
An external Bluetooth keyboard can be used to control iOS devices. Connect a keyboard as follows:
The keyboard control feature maps keyboard keys and shortcuts to specific iOS controls such as opening the control center, opening apps, and going home.
The typing behavior when using an external keyboard can be adjusted in several ways.
Switch control allows an individual with significantly limited movement to operate an iOS device using one or more external capability switches.