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Change of refraction and of plasma glucose concentration in a diabetic patient (case 4) over a period of 16 weeks after starting intensive glycaemic control on day 0. The change of refraction in an eye at a given time point represents the difference between the refractive error on that day and the refractive error at the time of admission. Transient bilateral hyperopic change was similar in both eyes, and appeared in response to a rapid reduction in plasma glucose.
