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Comparison of Simulated and True Keratometry Measurements Using Swept-Source Optical Coherence Tomography and Dual
Elizabeth A Urias1,2, Efstathia Polychronopoulou2, Rahul T Pandit1,2,3
1Blanton Eye Institute, Houston Methodist Hospital, Houston, TX, USA.
Journal of Ophthalmology
|September 27, 2021
Summary
The IOLMaster 700 and Galilei G4 show good correlation for simulated keratometry and astigmatism. However, the IOLMaster 700 measures steeper total keratometry values than the Galilei G4.
Area of Science:
- Ophthalmology
- Biomedical Engineering
- Optical Metrology
Background:
- Accurate keratometry and astigmatism measurements are crucial for successful intraocular lens (IOL) implantation.
- Different devices utilize varying technologies, potentially leading to discrepancies in measurements.
Purpose of the Study:
- To compare simulated keratometry (SimK) and total keratometry (TrueK) values between the IOLMaster 700 and Galilei G4.
- To evaluate corneal astigmatism measurements obtained from both devices.
Main Methods:
- Retrospective chart review of 200 eyes from 100 patients who underwent phacoemulsification.
- Inclusion of patients imaged with both IOLMaster 700 and Galilei G4.
- Comparison of mean, flat, and steep keratometry and astigmatism magnitude between devices.
Main Results:
- Moderate to high intraclass correlation coefficients (ICC) were observed for all measured variables.
- A statistically significant difference was found in TrueK measurements, with the IOLMaster 700 measuring steeper values (mean difference ±SD: -1.1156 ±0.438 D).
- Significant differences were noted in flat K, steep K, and mean K for TrueK, while only mean K differed significantly for SimK.
Conclusions:
- Good overall correlation exists between the IOLMaster 700 and Galilei G4 for SimK and astigmatism.
- A significant and clinically relevant difference in TrueK measurements necessitates consideration during IOL power calculations.
