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In Brief Purpose: To investigate the effect of the design of different exophthalmometers on their measurement accuracy. Methods: Eight different exophthalmometers were tested with a specially developed calibrator by experienced orbital surgeons. Results: Exophthalmometers with one mirror and a straight footplate were found to be more accurate than others. One-mirror exophthalmometers were less accurate when assessing low (≤12 mm) and high (≥23 mm) exophthalmometric values. Conclusions: The design of an exophthalmometer affects its accuracy. Exophthalmometers with one mirror and a straight footplate are more accurate than other instruments; calibration is necessary for standardization.
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Vardizer et al. (2005) studied this question.
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