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Used contact lens. Coloured scanning electron micrograph (SEM) of contaminants on the surface of a contact lens after 3 weeks of use. Dust and epithelial (skin) cells can be seen, along with a clump of bacteria (blue). If a contact lens is not cleaned regularly then these contaminants can cause inflammation and infection. Magnification: x2080 when printed 10 centimetres wide.
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