The optical manual, or Handbook of instructions for the guidance of surgeons in testing the range and quality of vision of recruits and others seeking employment in the military services of Great Britain, and in distinguishing and dealing with optical defects among the officers and men already engaged in them / by T. Longmore.

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The optical manual, or Handbook of instructions for the guidance of surgeons in testing the range and quality of vision of recruits and others seeking employment in the military services of Great Britain, and in distinguishing and dealing with optical defects among the officers and men already engaged in them / by T. Longmore. Public Domain Mark. Source: Wellcome Collection.