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Single-cell Suction Recordings from Mouse Cone Photoreceptors
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Revealing How Color Vision Phenotype and Genotype Manifest in Individual Cone Cells.

Furu Zhang1,2, Kazuhiro Kurokawa1, Marcel T Bernucci1

  • 1School of Optometry, Indiana University, Bloomington, Indiana, United States.

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Adaptive-optics optical coherence tomography visualizes individual cone function and structure, linking color vision genetics to specific cone types. This reveals how genetic variations manifest in cones, advancing our understanding of color vision and its anomalies.

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Area of Science:

  • Ophthalmology
  • Genetics
  • Optical Engineering

Background:

  • Psychophysical and genetic tests offer insights into color vision but don't detail cone-level manifestations.
  • Understanding cone-level function is crucial for elucidating the origins of color vision and its anomalies.

Purpose of the Study:

  • To investigate the relationship between color vision phenotype/genotype and individual cone function/structure.
  • To utilize adaptive-optics phase-sensitive optical coherence tomography (AO-PSOCT) for this investigation.

Main Methods:

  • AO-PSOCT was employed to measure cone optical responses to light in 16 human subjects with varying color vision.
  • Subjects included color-normal, deuteranopic, protanopic, and deuteranomalous trichromatic individuals.
  • Cone structure (density, mosaic, spatial arrangement) and spectral types (S, M, L) were analyzed.

Main Results:

  • Color normals have S, M, and L cones; deuteranopes lack M cones; protanopes lack L cones.
  • Deuteranomalous trichromats lack M cones but show evidence of L cone subtypes.
  • Cone function aligned with genotype and photopigment spectral separation; cone density was not associated with phenotype/genotype.

Conclusions:

  • AO-PSOCT provides a novel method for assessing color vision at the single cone level.
  • This technique bridges the gap between genotype and the physical manifestation of color vision in individual cones.