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Optical Assessment of Photoreceptor Function Over the Macula
Shuibin Ni1,2, Shanjida Khan1,2, Alfonso Jiménez-Villar1
1Casey Eye Institute, Oregon Health & Science University, Portland, OR, USA.
Translational Vision Science & Technology
|August 26, 2024
Summary
This study introduces ultrahigh-speed swept-source optical coherence tomography (UHS-SS-OCT) with the SSADOR algorithm for advanced photoreceptor imaging. This new method offers sensitive, objective, and quantifiable macular visual function measurements for retinal disease monitoring.
Area of Science:
- Ophthalmology
- Biomedical Engineering
- Medical Imaging
Background:
- Assessing macular visual function is crucial for diagnosing and monitoring retinal diseases.
- Current methods for evaluating photoreceptor function can be limited in speed, scope, or objectivity.
- Next-generation imaging techniques are needed for early detection and precise management of visual impairments.
Purpose of the Study:
- To develop and validate a novel functional photoreceptor imaging technique using ultrahigh-speed swept-source optical coherence tomography (UHS-SS-OCT) and the split-spectrum amplitude-decorrelation optoretinography (SSADOR) algorithm.
- To enable rapid, non-contact, objective, and quantifiable measurements of macular visual function.
- To advance the assessment of photoreceptor light response over a large retinal area.
Main Methods:
- A UHS-SS-OCT prototype with a 1 MHz A-scan rate was developed.
- A functional scanning protocol recorded 5 volumes in 3 seconds, using a selective flash pattern.
- The SSADOR algorithm quantified photoreceptor light response by analyzing OCT signal changes in the outer segment before and after light stimulation.
Main Results:
- The study enrolled 16 eyes from 8 subjects, successfully measuring photoreceptor light response.
- A record field of view (3 × 3 mm²) with high topographical resolution (~100 µm) was achieved.
- The SSADOR signal correlated with the flash pattern and strength, demonstrating consistency and reproducibility.
Conclusions:
- The integration of UHS-SS-OCT and SSADOR enables comprehensive characterization of photoreceptor function over a clinically relevant field of view.
- This approach allows for sensitive detection of changes in photoreceptor light response and focal impairments.
- The workflow is suitable for integration into routine clinical practice and trials for retinal disease management.
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