The five aspects of ergonomics are
3. Ease of use
the comfort shoes.
the comfort shoes are designed to provide comfort and cushioning for those who are on their feet all day, or are designed to relieve various kinds of foot pain.
handrails or grab bars in toilets.
the handrails or grab bars are designed to give support or balance.
ease of use:
they have large buttons and simple screens with large fonts are deigned to help the poor visioned elderly.
It actually turns itself of when the elderlies fall asleep during a nap, while the remote has big buttons.