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Start Over Subjects Asthenopia ✖Remove constraint Subjects: Asthenopia Subjects Refractive Errors ✖Remove constraint Subjects: Refractive Errors Authors Donders, F. C. (Franciscus Cornelis), 1818-1889, author ✖Remove constraint Authors: Donders, F. C. (Franciscus Cornelis), 1818-1889, author

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