In regions where disease risk is high and pathology labs are scarce, portable optical devices are providing much-needed diagnoses.MARCIA STAMELL, ASSOCIATE MANAGING EDITOR, marcia.stamell @photonics.comNowhere does the burden of disease weigh as heavily on people as it does in the low-resource settings of the developing world. Residents in parts of Asia, Africa and South America are highly vulnerable to communicable diseases such as malaria and tuberculosis. They also face increasing risk of developing noncommunicable “lifestyle” diseases common in the developed world such as obesity, high blood pressure and cancer. But people in low-resource regions don’t have access to the level of medical testing residents of wealthier countries enjoy and assume. 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