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Related Experiment Video

Updated: Oct 11, 2025

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Microvascular differences in amblyopic subgroups: An observational case-control study.

Müjdat Karabulut1, Sinem Karabulut1, Sabahattin Sül1

  • 152986Mugla Sıtkı Koçman University Medical School, Department of Ophthalmology, Mugla, Turkey.

European Journal of Ophthalmology
|December 3, 2021
PubMed
Summary

Retinal microvascular density is reduced in amblyopic eyes, particularly in the deep capillary plexus. These structural variations, detectable by optical coherence tomography angiography, differ across amblyopic subgroups.

Keywords:
Amblyopiacapillary plexuschoriocapillaris flow areafoveal thicknessvessel density

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Area of Science:

  • Ophthalmology
  • Retinal Imaging
  • Vascular Biology

Background:

  • Amblyopia, or lazy eye, is a developmental disorder affecting visual acuity.
  • Understanding the underlying retinal structural and microvascular changes in different types of amblyopia is crucial for diagnosis and treatment.
  • Optical coherence tomography angiography (OCTA) offers a non-invasive method to visualize retinal microvasculature.

Purpose of the Study:

  • To investigate and compare retinal microvascular differences in various amblyopic subgroups (strabismic, anisometropic, meridional, ametropic) versus healthy control eyes.
  • To assess variations in vessel density, foveal avascular zone area, and foveal thickness across these groups.

Main Methods:

  • An observational case-control study design was employed.
  • Participants included eyes from 23 strabismic, 23 anisometropic, 22 meridional, 22 ametropic amblyopic individuals, and 24 healthy controls.
  • Key metrics analyzed using OCTA included deep and superficial capillary plexus vessel densities, foveal avascular zone area, choriocapillaris flow area, and foveal thickness.

Main Results:

  • All amblyopic subgroups exhibited significantly lower vessel density in the deep capillary plexus compared to controls.
  • The superficial capillary plexus showed reduced density in ametropic and meridional amblyopic eyes.
  • Meridional amblyopic eyes displayed the largest choriocapillaris flow area and lowest overall vessel density. Foveal thickness was increased in anisometropic and meridional subgroups. Foveal avascular zone area was inversely related to foveal thickness.

Conclusions:

  • Distinct retinal structural and microvascular differences exist among various amblyopic subgroups.
  • OCTA is effective in non-invasively detecting these microvascular variations.
  • These OCTA-identified differences may correlate with the specific etiologic factors of each amblyopic type.