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Hertel exophthalmometry without orbital rim contact
1Department of Ophthalmology, Queen's University, Kingston, Ontario, Canada.
Ophthalmology
|May 1, 1994
Summary
A novel fixation adapter for the Hertel exophthalmometer enables accurate globe malposition measurement even with orbital rim damage. This innovation expands exophthalmometry applications in trauma and surgical cases.
Area of Science:
- Ophthalmology
- Medical Devices
- Surgical Innovation
Background:
- The Hertel exophthalmometer is standard for measuring globe malposition.
- Orbital rim damage limits Hertel exophthalmometer use.
- A new fixation adapter overcomes this limitation by using forehead and nasion fixation.
Observation:
- The adapter design was presented and discussed.
- Clinical cases were used for illustration.
- A study of 30 healthy patients assessed adapter validity against the standard Hertel.
- Measurements were compared using Wilcoxon statistics.
Findings:
- No statistical difference was found between the Hertel adapter and standard Hertel measurements (P > 0.05).
- Over 90% of measurements fell within +/- 1 mm, consistent with accepted variance.
- The adapter demonstrates high validity and reliability.
Implications:
- The fixation adapter is valuable for assessing trauma and surgical cases with orbital rim defects.
- It expands the application of Hertel exophthalmometry to previously challenging situations.
- This device enhances diagnostic capabilities in orbital reconstructive surgery.