Comparison of unilateral and simultaneous bilateral measurement of the globe position, using the Hertel exophthalmometer.

Hdl Handle:
http://hdl.handle.net/10147/208936
Title:
Comparison of unilateral and simultaneous bilateral measurement of the globe position, using the Hertel exophthalmometer.
Authors:
Ameri, Hossein; Fenton, Sinead
Affiliation:
Department of Ophthalmology, Cork University Hospital, Cork, Ireland.
Citation:
Ophthal Plast Reconstr Surg. 2004 Nov;20(6):448-51.
Journal:
Ophthalmic plastic and reconstructive surgery
Issue Date:
3-Feb-2012
URI:
http://hdl.handle.net/10147/208936
PubMed ID:
15599245
Abstract:
PURPOSE: To assess the effect of simultaneous measurement of the two eyes in Hertel exophthalmometry (i.e., when both readings are taken sequentially, without removing the instrument from the orbital rims) and to find out whether simultaneous measurement would influence the final reading of each eye. METHODS: In this prospective, comparative study, Hertel exophthalmometry was performed on 61 patients by two experienced observers. Only patients with no history of orbital disease were included. Three different measurements were performed on each patient by each observer. Initially, the right eye was measured separately, then the left eye was measured separately, and finally, both eyes were measured together. RESULTS: When the eyes were measured separately, in 30% of cases observers obtained equal readings in both eyes; in 47%, the difference between the two eyes was 1 mm; and in 23%, the difference was 2 mm or more. However, in simultaneous bilateral measurements, in 73% of cases, observers obtained equal readings in both eyes; in 24%, the difference between the two eyes was 1 mm; and only in 3% was the difference 2 mm or greater. Paired t tests showed that the mean difference between measurements of the two eyes was significantly smaller in simultaneous bilateral measurements (p <0.001). Interobserver variation was similar for measurements taken separately on each eye and for simultaneous bilateral measurements. CONCLUSIONS: When both eyes were measured simultaneously with the Hertel exophthalmometer, examiners were inclined to obtain similar readings in both eyes of patients with symmetrical-appearing eyes. The possible bias arising this way may reduce the reliability of Hertel exophthalmometer in relative exophthalmometry.
Language:
eng
MeSH:
Adolescent; Adult; Aged; Diagnostic Techniques, Ophthalmological/*instrumentation; Exophthalmos/*diagnosis; Eye/*pathology; Female; Humans; Male; Middle Aged; Observer Variation; Orbit/*pathology; Prospective Studies; Reproducibility of Results
ISSN:
0740-9303 (Print); 0740-9303 (Linking)

Full metadata record

DC FieldValue Language
dc.contributor.authorAmeri, Hosseinen_GB
dc.contributor.authorFenton, Sineaden_GB
dc.date.accessioned2012-02-03T15:07:53Z-
dc.date.available2012-02-03T15:07:53Z-
dc.date.issued2012-02-03T15:07:53Z-
dc.identifier.citationOphthal Plast Reconstr Surg. 2004 Nov;20(6):448-51.en_GB
dc.identifier.issn0740-9303 (Print)en_GB
dc.identifier.issn0740-9303 (Linking)en_GB
dc.identifier.pmid15599245en_GB
dc.identifier.urihttp://hdl.handle.net/10147/208936-
dc.description.abstractPURPOSE: To assess the effect of simultaneous measurement of the two eyes in Hertel exophthalmometry (i.e., when both readings are taken sequentially, without removing the instrument from the orbital rims) and to find out whether simultaneous measurement would influence the final reading of each eye. METHODS: In this prospective, comparative study, Hertel exophthalmometry was performed on 61 patients by two experienced observers. Only patients with no history of orbital disease were included. Three different measurements were performed on each patient by each observer. Initially, the right eye was measured separately, then the left eye was measured separately, and finally, both eyes were measured together. RESULTS: When the eyes were measured separately, in 30% of cases observers obtained equal readings in both eyes; in 47%, the difference between the two eyes was 1 mm; and in 23%, the difference was 2 mm or more. However, in simultaneous bilateral measurements, in 73% of cases, observers obtained equal readings in both eyes; in 24%, the difference between the two eyes was 1 mm; and only in 3% was the difference 2 mm or greater. Paired t tests showed that the mean difference between measurements of the two eyes was significantly smaller in simultaneous bilateral measurements (p <0.001). Interobserver variation was similar for measurements taken separately on each eye and for simultaneous bilateral measurements. CONCLUSIONS: When both eyes were measured simultaneously with the Hertel exophthalmometer, examiners were inclined to obtain similar readings in both eyes of patients with symmetrical-appearing eyes. The possible bias arising this way may reduce the reliability of Hertel exophthalmometer in relative exophthalmometry.en_GB
dc.language.isoengen_GB
dc.subject.meshAdolescenten_GB
dc.subject.meshAdulten_GB
dc.subject.meshAgeden_GB
dc.subject.meshDiagnostic Techniques, Ophthalmological/*instrumentationen_GB
dc.subject.meshExophthalmos/*diagnosisen_GB
dc.subject.meshEye/*pathologyen_GB
dc.subject.meshFemaleen_GB
dc.subject.meshHumansen_GB
dc.subject.meshMaleen_GB
dc.subject.meshMiddle Ageden_GB
dc.subject.meshObserver Variationen_GB
dc.subject.meshOrbit/*pathologyen_GB
dc.subject.meshProspective Studiesen_GB
dc.subject.meshReproducibility of Resultsen_GB
dc.titleComparison of unilateral and simultaneous bilateral measurement of the globe position, using the Hertel exophthalmometer.en_GB
dc.contributor.departmentDepartment of Ophthalmology, Cork University Hospital, Cork, Ireland.en_GB
dc.identifier.journalOphthalmic plastic and reconstructive surgeryen_GB
dc.description.provinceMunster-

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