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  • Title: Parallax-free exophthalmometry: a comprehensive review of the literature on clinical exophthalmometry and the introduction of the first parallax-free exophthalmometer.
    Author: Genders SW, Mourits DL, Jasem M, Kloos RJ, Saeed P, Mourits MP.
    Journal: Orbit; 2015 Feb; 34(1):23-9. PubMed ID: 25313439.
    Abstract:
    PURPOSE: To present the first parallax-free exophthalmometer design. BACKGROUND: Exophthalmometry is an important clinical tool. We provide a historic overview of clinical exophthalmometer designs, and we review current problems encountered in exophthalmometry. METHODS: We present a new and parallax-free exophthalmometer design that we have evaluated in 49 patients visiting our orbital clinic. RESULTS: The mean age of the patients was 49.8 years and 72% were female. The Pearson interobserver variation was 0.97, and 94% of the Hertel values measured by the two observers were within the limits (1.6 mm) of agreement. CONCLUSION: This meter appears to be a reliable instrument for exophthalmometry. It is the first instrument that allows for a complete parallax-free measurement.
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