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Do we really know how vision is corrected? Do we know how physics, glasses, contact lenses, and even laser surgery help our eyes see better? Cécile goes to the Quinze-Vingts National Ophthalmology Hospital in Paris for an eye exam. Dr. Gabriel Hallali gives her various tests and explains how vision problems are diagnosed and how they can be corrected. Mathieu visits the eyeglass lens manufacturing plant in Bazainville, where he meets Patrice Camacho, eye health manager. There, he discovers how corrective lenses are made. Max explains the main vision problems and how different types of lenses work on the eye to correct vision.