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Silver's oil filled Self-refraction glasses
A pair of glasses developed by Joshua Silver, a physics professor at the University of Oxford, offers an affordable solution in the developing countries where millions of people struggle to operate machinery, read from a blackboard, or just see the world around them.
There is a chronic shortage of optometrists — in Ghana, for example, there is just one for every eight million people. That makes it incredibly difficult for ordinary people to visit an optometrist to get glasses. But Silver’s oil filled Self-refraction glasses let the wearer adjust the lenses to suit their vision, without the need for an optometrist.
They consist of clear membranes filled with silicon oil, protected by plastic discs. The wearer can adjust the amount of oil in the lenses using a dial fitted to a syringe on the arms of the glasses.
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.
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I happen to think this is an excellent invention
I happened to think about these many years ago, but Joshua Silver acted on it; which is called reduction to practice.