Student's guide to diseases of the eye / by Edward Nettleship ; with a chapter on examination for color perception by William Thomson.

Nettleship, Edward, 1845-1913.

Date:: 1883

Credit: Student's guide to diseases of the eye / by Edward Nettleship ; with a chapter on examination for color perception by William Thomson. Source: Wellcome Collection.

Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.

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$found to be defective in color-sense or in vision, but to pass over each examination with the same general care, and afterwards send for those giving indications of defects, to come in singly for fuller examination. The examination should be private as far as practicable, especially excluding persons who are to be subsequently examined. Inability to name color accurately, or to distinguish nicely as to difference in tint, is not to be taken as an evi- dence of color-blindness. In testing as to hearing, if the watch used can be heard at five feet distant, and the person examined hears it only at one foot, his hearing would be 1-5, and may be so recorded in fractions. Conversation in an ordinary tone should be heard at ten feet. It should be understood that all employes examined, failing to come up to the requirements of the above stand- ard, shall be accorded the benefit of a professional ex- amination. When acuteness of vision is below the standard adopted, it may be possible to restore full vision by proper glasses, when it is due to optical defects, known as near- sight, far-sight, or astigmatism, or by other medical or surgical treatment, and useful men may then be retained in the company's service. These rules and regulations, having been approved by the Board of Managers, have been put into effect on the Pennsylvania Railroad, under the general supervision of the writer, and give entire satisfaction,]$