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Credit
An examination, under atropine, of the refractive state of eyes with normal vision (20/20), and which had never been affected with asthenopia or inflammation / by D.B. St. John Roosa. Public Domain Mark. Source: Wellcome Collection.
Provider
This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.