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The judgement of the machines: disputing a vision test in a 1926 Shanghai courtroom

Published online by Cambridge University Press:  26 May 2026

Jingwen Li*
Affiliation:
Department of History, Princeton University, USA
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Abstract

This essay examines how the interplay between diagnostic machines and patient experience reshaped the meaning of testing validity, through a 1926 malpractice lawsuit in colonial Shanghai. It traces how complaints of dizziness, a seemingly mundane side effect of new glasses, escalated into a legal and epistemic dispute over the validity of a vision test. Weaving together competing perspectives presented in court, the essay uncovers discrepancies between the examiner’s observations, the machine’s readings and the patient’s embodied experience. These clashes expose the fragility of the new regime of ‘scientific testing’ in the global city of Shanghai, which claimed authority from the emerging profession of optometry and a diagnostic machine known as the retinoscope. The case, I argue, marks an inflection point in the history of testing, as patient experience was recalibrated through new machines, re-legitimized in novel ways, and transformed into a generative feature of diagnostic practice itself.

Information

Type
Research Article
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.
Copyright
© The Author(s), 2026. Published by Cambridge University Press on behalf of British Society for the History of Science.
Figure 0

Figure 1. ‘An illustration of the objective refracting examination’, from Jingyi yanjing gongsi shizhou jinian ce (The Tenth Anniversary of the Chinese Optical Company), Shanghai, 1921. Courtesy of the Shanghai Library.Figure 1 long description.