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A systematic comparison and evaluation of three different Swept-Source interferometers for eye lengths biometry
Haroun Al-Mohamedi1, Ismael Kelly-Pérez1, Andreas Prinz1
1Universitäts-Augenklinik Tübingen, Stiftungslabor für Grundlagenforschung, 72076 Tuebingen, Germany.
Zeitschrift Fur Medizinische Physik
|June 6, 2018
Summary
This study compares three Swept-Source interferometer designs for eye biometry. Fourier Domain Mode Locking (FDML) offers the best performance for accurate optical measurements.
Area of Science:
- Biomedical Optics
- Ophthalmic Instrumentation
- Interferometry
Background:
- Swept-Source interferometry is crucial for precise eye biometry.
- Different wavelength tuning methods impact interferometer performance.
- Accurate ocular measurements are vital for diagnosing and managing eye conditions.
Purpose of the Study:
- To systematically compare three distinct Swept-Source interferometer designs.
- To evaluate their suitability for ocular biometric measurements.
- To analyze the principles, characteristics, conveniences, and accessibility of each system.
Main Methods:
- Development and comparison of three Swept-Source interferometer systems.
- Wavelength tuning methods investigated: quasi-phase-continuous (QPC), rotating polygon mirror scanner, and Fourier Domain Mode Locking (FDML).
- Evaluation using a fiber-optic based Michelson interferometer setup and a human eye model.
Main Results:
- QPC method allowed longer measuring depth but was slower.
- Rotating polygon mirror scanner offered faster wavelength tuning.
- FDML achieved the widest tuning range, with improved resolution and signal-to-noise ratio (SNR).
- All systems clearly detected ocular component interfaces and contours in the model eye.
Conclusions:
- FDML is the most promising method for Swept-Source interferometry in eye biometry due to its superior range, resolution, and SNR.
- The choice of wavelength tuning method significantly influences measurement speed, depth, and accuracy.
- Swept-Source interferometers demonstrate high potential for accurate and detailed ocular biometric data acquisition.
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