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Updated: Apr 28, 2026

Imaging Ca2+ Dynamics in Cone Photoreceptor Axon Terminals of the Mouse Retina
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S-Cone Retinal Pathway Dysfunction in Myopia.

Safal Khanal1, Rohit Dhakal1

  • 1Department of Optometry and Vision Science, University of Alabama at Birmingham, Birmingham, Alabama, United States.

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|April 27, 2026
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Summary
This summary is machine-generated.

Blue cone pathway activity is reduced in myopia, correlating with refractive error and axial length. This suggests functional deficits in the blue cone retinal pathway for individuals with myopia.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Vision Science

Background:

  • Myopia, or nearsightedness, is a prevalent refractive error.
  • The S-cone pathway, responsible for blue light perception, plays a role in visual function.
  • Understanding S-cone pathway activity in myopia is crucial for comprehending visual system alterations.

Purpose of the Study:

  • To compare S-cone retinal pathway activity in individuals with and without myopia.
  • To investigate the association between S-cone pathway activity, refractive error, and axial length.

Main Methods:

  • Full-field electroretinogram (ERG) testing was performed on 48 participants (23 myopes, 25 non-myopes).
  • S-cone ERGs were recorded using blue flashes on an amber background after adaptation to white and amber light.
  • Responses were analyzed and correlated with refractive error and axial length.

Main Results:

  • S-cone ERG amplitudes were significantly smaller in myopic participants compared to non-myopes (12.42 ± 0.95 µV vs. 16.45 ± 1.08 µV).
  • S-cone ERG amplitudes showed a positive correlation with refractive error (r = 0.49) and a negative correlation with axial length (r = -0.49).
  • Adaptation to amber light reduced S-cone ERG amplitudes in non-myopes but not in myopes.

Conclusions:

  • Myopic individuals exhibit reduced S-cone ERG amplitudes, approximately 25% lower than non-myopes.
  • These reductions are associated with the severity of myopia and increased axial length.
  • Findings suggest functional deficits in the S-cone retinal pathway in individuals with myopia.