It is ironic that those of us who can most afford to buy sunglasses probably need them the least. Using a pair of Ray-Bans to prevent glare whilst driving one's Porsche towards a sunset is not the same level of need as that experienced by someone toiling in a sunny field all day.
Thus Swiss product designer Christophe Guberan developed an experimental design for sunglasses at a workshop hosted by the National Institute of Design in Ahmedabad, India. Guberan chose an inexpensive material and a heat-based production method to create something that does not require lenses. The design is simple enough that its story can be told in three pictures:
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Obviously they're not perfect from an ergonomic perspective—there's no telling how comfortable they'd be to wear for hours—but this is a great example of outside-of-the-box thinking and of designing something for real-world production in a resource-scarce context.