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The economic costs of vision impairment are many, and in the developing world they are rampant. Refractive errors in vision make it difficult to read (and thus become educated), to drive or operate machinery, and to be productive in the workplace and in society in general. Limited mobility caused by visual impairments can also lead to other physical and mental health problems.

All said, the costs associated with these byproducts of refractive error are high--more than $200 billion per year globally. A study coming out of the Australia's Brien Holden Vision Institute and Johns Hopkins University says that with an initial investment of just $28 billion globally, authorities could train up 47,000 clinical eye car providers to provide exams and prescriptions as well as 18,000 optical dispensers to create those glasses. That would set up the program for five years, the study says, over which time nearly a trillion dollars in global economic benefits would be generated.

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