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Portable widefield fundus camera with high dynamic range imaging capability.

Alfa Rossi1, Mojtaba Rahimi1, David Le1

  • 1Department of Biomedical Engineering, University of Illinois at Chicago, Chicago, IL 60607, USA.

Biomedical Optics Express
|March 6, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a portable fundus camera with enhanced high dynamic range (HDR) imaging and a wider field of view (FOV). This innovation improves early eye disease detection and treatment assessment by overcoming limitations of conventional fundus photography.

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Biomedical Engineering

Background:

  • Conventional fundus photography has limitations in image contrast and field of view (FOV).
  • These limitations hinder the early detection of subtle eye diseases and reliable assessment of treatment efficacy.
  • Improvements in contrast and FOV are crucial for advancing ophthalmic diagnostics.

Purpose of the Study:

  • To develop and evaluate a portable, wide FOV fundus camera with high dynamic range (HDR) imaging capabilities.
  • To enhance image contrast and expand FOV for improved early eye disease detection.
  • To provide a nonmydriatic solution for comprehensive fundus imaging.

Main Methods:

  • Utilized miniaturized indirect ophthalmoscopy illumination for a portable, nonmydriatic design.
  • Employed orthogonal polarization control to mitigate illumination reflectance artifacts.
  • Acquired and fused three sequential images with independent power controls for HDR imaging and contrast enhancement.
  • Achieved a 101° eye-angle (67° visual-angle) snapshot FOV, expandable to 190° (134° visual-angle) with a fixation target.

Main Results:

  • Demonstrated a portable wide FOV fundus camera with HDR imaging capability.
  • Successfully enhanced local image contrast through HDR fusion.
  • Achieved a wide snapshot FOV of 101° (eye-angle) without pupillary dilation.
  • Expanded effective FOV up to 190° (eye-angle) using a fixation target.
  • Validated HDR imaging effectiveness in both healthy and pathologic eyes compared to conventional methods.

Conclusions:

  • The developed portable fundus camera offers significant improvements in image contrast and FOV coverage.
  • This technology facilitates earlier detection of eye diseases and more reliable treatment assessment.
  • The nonmydriatic, widefield HDR fundus camera represents a valuable advancement in ophthalmic imaging.