The harmonious non-symmetrical action of the oblique muscles explains 'binocular astigmatism' / by G.C. Savage.

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The harmonious non-symmetrical action of the oblique muscles explains 'binocular astigmatism' / by G.C. Savage. Public Domain Mark. Source: Wellcome Collection.

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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.