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Brain Activation Induced by Myopic and Hyperopic Defocus From Spectacles.

Meng-Tian Kang1,2, Bo Wang3, An-Ran Ran4

  • 1Beijing Ophthalmology and Visual Science Key Lab, Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing, China.

Frontiers in Human Neuroscience
|October 1, 2021
PubMed
Summary

Myopic defocus significantly increases blood flow in visual attention brain regions. This finding suggests a link between retinal defocus and neural activity, warranting further research into visual perception and brain function.

Keywords:
arterial spin labelingdefocusfMRImyopianeural change

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Visual Science

Background:

  • Refractive errors like myopia and hyperopia alter visual input.
  • Understanding the neural processing of induced defocus is crucial for visual perception research.

Purpose of the Study:

  • To investigate neural changes associated with myopic and hyperopic defocus in ametropic and emmetropic individuals.
  • To utilize functional magnetic resonance imaging (fMRI) to assess regional cerebral blood flow (rCBF) changes.

Main Methods:

  • 41 subjects (emmetropic and ametropic) underwent fMRI with arterial spin labeling (ASL).
  • Induced myopic (+2.00D) and hyperopic (-2.00D) defocus states were compared to full correction.
  • Behavioral tests (visual acuity, contrast sensitivity) were performed concurrently.

Main Results:

  • Myopic defocus significantly increased rCBF in visual attention-related areas (precentral gyrus, superior temporal gyrus, inferior parietal lobule, middle temporal gyrus).
  • These effects were less pronounced in low myopes compared to emmetropes.
  • Hyperopic defocus showed increased rCBF only in the precentral gyrus.

Conclusions:

  • Myopic defocus stimulates increased perfusion in brain regions linked to visual attention.
  • This highlights a potential connection between retinal defocus and its neural consequences.
  • Further research is suggested to explore the relationship between retinal defocus and brain activity.