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Clinical assessment of the Zeiss IOLMaster.
Ingrid Kielhorn1, Madhavan S Rajan, Peter M Tesha
1Department of Ophthalmology, Pembury Hospital, The Laser Eye Clinic, Kent, United Kingdom. ikielhorn@doctors.org.uk
Journal of Cataract and Refractive Surgery
|March 29, 2003
Summary
Optical biometry using the Zeiss IOLMaster demonstrates excellent repeatability for axial length and intraocular lens power calculations, even with varying examiner experience. Agreement with ultrasonic biometry requires further investigation.
Area of Science:
- Ophthalmology
- Biometry
- Medical Devices
Background:
- Accurate biometry is crucial for intraocular lens (IOL) power calculation.
- Optical biometry offers a non-contact method for measuring ocular parameters.
Purpose of the Study:
- To compare axial lengths and IOL power calculations using the Zeiss IOLMaster between examiners with different training levels.
- To assess the agreement between optical biometry (IOLMaster) and acoustic biometry (ultrasonic).
Main Methods:
- Prospective study involving 79 patients.
- Optical biometry performed twice by a qualified nurse and a healthcare assistant.
- Ultrasonic biometry performed by the qualified nurse for comparison.
Main Results:
- High correlation coefficients (0.99) for axial length and IOL power between examiners.
- Excellent repeatability for IOL power (0.58 D) and axial length (0.07 mm).
- Strong correlation between IOLMaster and A-scan measurements (0.97-0.98).
Conclusions:
- Optical biometry demonstrates excellent repeatability irrespective of examiner's medical training.
- The precision and agreement of optical biometry compared to ultrasonic methods warrant further study.