Retinal Tissue Thickness is Reduced in Diabetic Peripheral Neuropathy

Area of Science:

• Ophthalmology
• Endocrinology
• Neuroscience

Background:

• Diabetic peripheral neuropathy (DPN) is a common complication of diabetes mellitus.
• Retinal structural changes may occur in individuals with diabetes and DPN.
• Optical coherence tomography (OCT) is a valuable tool for assessing retinal layer thickness.

Purpose of the Study:

• To investigate the association between diabetic peripheral neuropathy (DPN) and retinal tissue thickness.
• To determine if DPN severity correlates with specific retinal layer measurements.
• To explore the relationship between DPN, diabetic retinopathy (DR), and retinal structure.

Main Methods:

• Spectral domain optical coherence tomography (SD-OCT) was used to measure retinal thickness in various zones, including the ganglion cell complex and retinal nerve fiber layer (RNFL).
• 193 participants (84 with type 1 diabetes, 67 with type 2 diabetes, 42 healthy controls) were included.
• Multiple regression analysis was performed, adjusting for diabetic retinopathy (DR), age, sex, diabetes duration, and HbA1c levels.

Main Results:

• Perifoveal retinal thickness was inversely associated with DPN severity in individuals with diabetes.
• Diabetic retinopathy (DR) was linked to reduced parafoveal thickness.
• Retinal nerve fiber layer (RNFL) thickness was diminished in individuals with more severe DPN.

Conclusions:

• Diabetic peripheral neuropathy (DPN) is associated with structural compromise in multiple retinal layers.
• These retinal changes may pose a risk to visual function.
• Further research is needed to explore the functional consequences of these structural alterations.