Airman 1st Class Waeya Lin, 109th Medical Group medical technician, performs an eye exam for a patient in support of Innovative Readiness Training Ola de Esperanza Sanadora Sept. 1, 2018, in Humacao, Puerto Rico. Optometry technicians first check patients’ prescriptions, if they have glasses, using an auto-refractor. This gets the prescription in the correct ballpark, and allows the optometrist to fine-tune when they perform a manifest refraction exam.

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Photo credit: © Bob Collet / Alamy / Afripics
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