Professor pioneers DIY adjustable glasses that do not need an optician, at a potential cost of $1 per pair. --The Guardian[1]

Consider how this invention plays out if the inventor engages in profit maximizing behavior. Who benefits? How much? Over what period of time?

Now consider how it plays out in a world where every person who needs glasses can own a pair of them. As a part of your analysis include the value of increased productivity, especially in 3rd world countries.