Apple Accessibility
General overview of accessibility on Apple:
https://www.apple.com/uk/accessibility
Sight-impaired accessibility on iMac (but the iPad and iPhone also have most of these features):
https://www.apple.com/uk/accessibility/mac/vision
Command shortcuts on iMac:
https://support.apple.com/en-us/HT201236
VoiceOver Basics Tutorial:
https://m.youtube.com/watch?v=n0dbZdBsJpE
VoiceOver Commands:
http://lab.dotjay.com/notes/voiceover-commands
Built In Magnifier Tutorial:
https://m.youtube.com/watch?v=xpUWovtDyQo
Zoom Tutorial:
https://m.youtube.com/watch?v=DPjn6BCjmGA
Useful apps for the sight impaired:
https://www.henshaws.org.uk/blog/5-of-the-best-apps-for-people-with-sight-loss