To investigate the association between glycemic variability and early neuroretinal changes in pediatric patients with type 1 diabetes without microvascular complications.
Approach:
Study Design: A 3-year longitudinal study involving 25 pediatric patients aged 10 to 20 years with type 1 diabetes and 18 age-matched healthy controls.
Measurement Techniques: Spectral-domain optical coherence tomography (OCT) was used to measure neuroretinal layer thickness.
Evaluation Metrics: Changes in retinal structure were evaluated alongside continuous glucose monitoring (CGM)-derived measures of glycemic variability, HbA1c, and neuropathic measures.
Key Findings:
At baseline, inner retinal nerve fiber layer thickness was lower in patients with type 1 diabetes compared to controls (20 μm vs. 21 μm).
Significant thinning of the inner ganglion cell layer and outer plexiform layer was observed during follow-up.
Greater glycemic variability was associated with thinner retinal layers, particularly the inner nuclear and outer plexiform layers.
Greater time in range correlated with thicker retinal layers.
No significant correlations were found between HbA1c levels and macular layer thickness.
Interpretation:
Higher glycemic variability and lower time in range were linked to inner retinal thinning and less stable retinal structure over the 3-year period.
Limitations:
Small sample size and highly selected population with good glycemic control and no microvascular complications.
Lack of corneal confocal microscopy in the study.
Conclusion:
Further longitudinal evaluation is required to determine if neuroretinal nerve damage can serve as a non-invasive predictive marker of diabetic neuropathy.
