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Structure-function relationship in early diabetic retinopathy: a spatial correlation analysis with OCT and

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  • 1University of Milan, San Paolo Hospital, Milan, Italy.

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Summary

Type 2 diabetes patients without retinopathy show a significant link between inner retinal thickness and visual sensitivity. This suggests diabetes impacts inner retina structure and function even before retinopathy signs appear.

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Area of Science:

  • Ophthalmology
  • Diabetology
  • Neuroscience

Background:

  • Type 2 diabetes is a systemic disease affecting multiple organs, including the eyes.
  • Diabetic retinopathy is a common complication, but early functional and structural changes may occur before clinical signs.

Purpose of the Study:

  • To investigate the correlation between the thickness of the ganglion cell layer-inner plexiform layer (GCL-IPL) and retinal sensitivity in Type 2 diabetes patients.
  • To assess if this correlation differs in patients with and without diabetic retinopathy.

Main Methods:

  • Analyzed 35 healthy subjects and 26 Type 2 diabetic patients without diabetic retinopathy.
  • Measured best-corrected visual acuity (BCVA), contrast sensitivity (CS), and retinal sensitivity using microperimetry.
  • Acquired macular spectral-domain optical coherence tomography (SD-OCT) scans to measure GCL-IPL thickness.

Main Results:

  • No significant differences in BCVA or GCL-IPL thickness between groups.
  • Diabetic subjects showed lower binocular contrast sensitivity.
  • A significant positive correlation between GCL-IPL thickness and retinal sensitivity was found in diabetic subjects (p=0.0007), but not in healthy subjects (p=0.77).

Conclusions:

  • Diabetes is associated with a distinct structure-function relationship in the inner retina, even without retinopathy.
  • This suggests diabetes-induced changes may contribute to visual function decline in the inner retina.
  • Inner retinal layer thickness is a potential biomarker for early diabetic eye disease.