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Interocular biometric parameters comparison measured with swept-source technology.
César Albarrán-Diego1, Francisco Poyales2, Esther López-Artero2
1Optics, Optometry and Vision Science Department, Faculty of Physics, University of Valencia, Dr Moliner 50, 46100, Burjassot, Spain.
International Ophthalmology
|August 21, 2021
Summary
Ocular biometric parameters show excellent interocular symmetry, with no clinically significant differences found between eyes. This symmetry is crucial for accurate intraocular lens power calculations, especially when measurements are missing in one eye.
Area of Science:
- Ophthalmology
- Biometry
- Optics
Background:
- Accurate intraocular lens (IOL) power calculation is essential for successful refractive outcomes after cataract surgery.
- Interocular symmetry of ocular parameters is a key assumption in many biometry calculations.
- Understanding interocular differences is critical when measurements are unavailable for one eye.
Purpose of the Study:
- To evaluate the symmetry of interocular biometric parameters.
- To determine if clinically relevant differences exist between the eyes for parameters used in IOL power calculation.
- To assess the reliability of measurements from one eye when the fellow eye's data is compromised.
Main Methods:
- Prospective, cross-sectional study of 4090 subjects.
- Swept-source optical biometry using IOLMaster 700.
- Evaluation of axial length (AL), mean anterior curvature (Rm), anterior chamber depth (ACD), lens thickness (LT), central corneal thickness (CCT), white-to-white (WTW), Chang-Waring chord distance (CWC-D), and Chang-Waring chord angle (CWC-A).
Main Results:
- Excellent interocular correlation was observed for most biometric parameters, excluding CWC.
- Agreement for axial length (AL) was better in eyes shorter than 24 mm.
- The linearity of the right eye (OD) vs. left eye (OS) relationship was confirmed for all parameters (p > 0.05).
Conclusions:
- No clinically significant interocular differences were found for the evaluated biometric parameters.
- Statistically significant differences were noted for all parameters except lens thickness (LT).
- Moderate interocular differences in axial length (AL) may occur in eyes exceeding 24 mm.
