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Related Experiment Video

Updated: Nov 19, 2025

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Functional retinal imaging using adaptive optics swept-source OCT at 1.6 MHz.

Mehdi Azimipour1, Justin V Migacz1, Robert J Zawadzki1

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Summary

This study introduces an adaptive optics optical coherence tomography system to measure single cone photoreceptor responses. This novel method detects functional changes, potentially enabling earlier diagnosis of retinal diseases.

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Area of Science:

  • Ophthalmology
  • Biomedical Optics
  • Retinal Imaging

Background:

  • Current methods for retinal disease diagnosis have limitations in early detection.
  • Optical assessment of photoreceptor function offers potential for earlier diagnosis.

Purpose of the Study:

  • To develop and describe an adaptive optics optical coherence tomography (AO-OCT) system.
  • To measure functional responses of single cone photoreceptors to visible stimuli.

Main Methods:

  • Utilized a raster-scanning Fourier-domain mode-locked laser OCT system (1.64 MHz, 1063 nm center wavelength).
  • Integrated a closed-loop adaptive optics (AO) system for high-resolution imaging.
  • Analyzed serial volumetric images to assess cone photoreceptor changes.

Main Results:

  • Observed phase changes in cone photoreceptors correlated with outer segment elongation.
  • Demonstrated that elongation was proportional to stimulus intensity.
  • Identified other morphological changes in the outer segment and retinal pigment epithelium.

Conclusions:

  • AO-OCT can measure functional responses of individual cone photoreceptors.
  • Detected stimulus-induced changes in cone morphology, indicating functional assessment.
  • This technology may lead to earlier detection of retinal diseases.