Changing the amount of oil in the lenses changes their curvature, which alters their strength. When someone has adjusted the lenses to suit their vision, the lenses are sealed with a valve and the syringes removed, giving near-instant glasses with no need for an optometrist.

The things they think of! Hope they do some good for some.

"In the developing world millions of people struggle to operate machinery"

Machinery, no doubt, used by formally employed Americans

Also, the term "developing world" is a misnomer. A country must first be destroyed, stripped of its natural resources, and its labor and markets exploited by imperialist entities in order for it to be downgraded to the status of a "developing country".

genius!! more design awards (and research funding) should go out towards developing stuff like this.