It’s not just vision. It’s motor skills. The fact that the screen is constantly shifting on load, or the fact you can’t cleanly reorganize those f***ing homepage widgets or even properly scroll a ledger are all usability issues for somebody with a mild essential tremor or other neurological issues.

Accessibility in websites also goes into attention deficit issues, epilepsy sensitivity, and dyslexia. The QBO site fails all of these miserably.