Appleアクセシビリティ
https://www.apple.com/jp/accessibility/iphone/vision/
Appleアクセシビリティサポート
https://support.apple.com/ja-jp/accessibility/iphone-ipad
iPhoneアクセシビリティ機能
https://help.apple.com/iphone/11/?lang=ja#/iph3e2e4367
iPadアクセシビリティ機能
https://help.apple.com/ipad/11/?lang=ja#/iPad9a2465f9