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Simultaneous optical coherence tomography and Scheimpflug imaging using the same incident light.

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    Area of Science:

    • Ophthalmic imaging
    • Biomedical optics
    • Corneal topography

    Background:

    • Current anterior chamber imaging methods face a trade-off between image field-of-view and resolution.
    • Acquiring comprehensive anterior segment data often necessitates using multiple imaging devices.
    • There is a need for a single device capable of simultaneous wide-field and high-resolution imaging of the anterior eye.

    Purpose of the Study:

    • To present a novel raster scanning tomographic imaging device.
    • To achieve simultaneous acquisition of large field-of-view Scheimpflug images and high-resolution spectral domain optical coherence tomography (SD-OCT) images.
    • To enable simultaneous measurement of fine corneal layers and overall anterior chamber topology using a single system.

    Main Methods:

    • Development of a novel raster scanning tomographic imaging device.
    • Integration of a tunable lens system and numerical methods for 3D Scheimpflug imaging distortion correction.
    • Simultaneous capture of Scheimpflug and SD-OCT data using the same illuminating photons.

    Main Results:

    • The device successfully acquired simultaneous large field-of-view Scheimpflug (12.5 mm depth, 50 µm resolution) and high-resolution SD-OCT (2 mm depth, 3.7 µm resolution) images.
    • Ex vivo measurements on porcine and bovine eyes showed reasonable agreement in central corneal thickness (CCT) between the two modalities.
    • The system enabled simultaneous imaging of the same sample location, facilitating concurrent measurement of thickness and refractive index.

    Conclusions:

    • The novel raster scanning tomographic imaging device effectively overcomes the compromise between image size and resolution in anterior segment imaging.
    • Simultaneous Scheimpflug and SD-OCT measurements provide a unique, efficient method for comprehensive anterior eye assessment.
    • This technology offers potential for improved diagnosis and management of ocular conditions affecting the anterior segment.