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Review
. 2015 Feb;34(1):23-9.
doi: 10.3109/01676830.2014.963877. Epub 2014 Oct 14.

Parallax-free exophthalmometry: a comprehensive review of the literature on clinical exophthalmometry and the introduction of the first parallax-free exophthalmometer

Stijn W Genders  1 , Daphne L Mourits, Mohammad Jasem, Roel J H M Kloos, Peerooz Saeed, Maarten Ph Mourits
Affiliations
Review

Parallax-free exophthalmometry: a comprehensive review of the literature on clinical exophthalmometry and the introduction of the first parallax-free exophthalmometer

Stijn W Genders et al. Orbit. 2015 Feb.

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.

Keywords: Exophthalmometer; exophthalmometry; exophthalmos; parallax error; proptosis.

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