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Related Experiment Video

Updated: Aug 23, 2025

Transpupillary Two-Photon In Vivo Imaging of the Mouse Retina
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Seeing invisible light: 2-photon microperimetry to measure visual function.

Urmi Mehta1,2, Grazyna Palczewska1,3, Ken Y Lin1

  • 1Gavin Herbert Eye Institute, Department of Ophthalmology, University of California-Irvine, Irvine, CA, 92617, USA.

American Journal of Ophthalmology Case Reports
|November 3, 2022
PubMed
Summary
This summary is machine-generated.

Infrared 2-photon microperimetry (2PM-IR) offers a more stable assessment of retinal sensitivity compared to visible light tests, especially in patients with cataracts. This infrared approach may improve early macular disease diagnosis.

Keywords:
Two-photon microperimetryVisual sensitivitycataracts

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Visual Neuroscience

Background:

  • Conventional visual function tests using visible light are less accurate in patients with optical media opacities like cataracts.
  • Infrared (IR) light penetrates tissues better and is less affected by opacities, suggesting potential for improved visual function assessment.

Purpose of the Study:

  • To compare the accuracy of infrared 2-photon microperimetry (2PM-IR) with conventional visual function tests.
  • To evaluate 2PM-IR's performance in a patient with significant cataract before and after surgery.

Main Methods:

  • Evaluated visual function using 2PM-IR, visible light 2-photon microperimetry (2PM-Vis), conventional microperimetry (cMP), and cone contrast threshold (CCT) tests.
  • Tests were performed on a patient with brunescent nuclear sclerotic and posterior subcapsular cataract before and after surgical intervention.

Main Results:

  • Retinal sensitivity improved by 3.4 dB with 2PM-IR, 17.4 dB with 2PM-Vis, and 18 dB with cMP post-surgery.
  • Cone contrast sensitivity also showed improvements across S-cones (111), M-cones (14), and L-cones (30).

Conclusions:

  • 2PM-IR demonstrated minimal variability in retinal sensitivity, unlike conventional tests, suggesting superior stability in the presence of optical opacities.
  • IR visual stimulation may offer a more accurate method for assessing neurosensory retinal function, potentially aiding in early macular disease diagnosis.