Extended measuring depth dual-wavelength Fourier domain optical coherence tomography.

Area of Science:

• Biomedical Optics
• Ophthalmology
• Medical Imaging

Background:

• Accurate optical A-scan biometry is crucial for refractive error assessment.
• Existing spectral domain optical coherence tomography (SD-OCT) techniques face limitations in depth and accuracy.

Purpose of the Study:

• To present an enhanced wide range dual band spectral domain optical coherence tomography (SD-OCT) technique.
• To improve the depth and accuracy of optical A-scan biometry measurements.

Main Methods:

• Utilized a Michelson interferometer with two wide-spectrum Superluminescent Diodes (SLDs).
• Employed a long-pass filter (900 nm) and a reflective diffraction grating (1,800 lines/mm).
• Captured the spectrally decomposed light using two CCD line sensors.

Main Results:

• Demonstrated an enhanced wide range dual band SD-OCT system.
• Achieved increased depth and accuracy in optical A-scan biometry measurements.
• Validated system capabilities using a self-made human model eye.

Conclusions:

• The presented enhanced dual band SD-OCT technique offers improved performance for optical biometry.
• The system shows potential for more precise ophthalmic measurements.