I don't know if anyone has posted this lately:
https://www.indiegogo.com/projects/peek-retina-help-fight-avoidable-blindness#/updates
PEEK (Portable Eye Examination Kit). In one of the videos, the price of 60
pounds is mentioned, less for NGOs and health organizations. Great for
screening in the wilds of Africa.
Denice is right: The End Is Near.
Tom