Retinal Sensitivity over Hard Exudates in Diabetic Retinopathy

Area of Science:

• Ophthalmology
• Retinal Imaging
• Diabetic Retinopathy Research

Background:

• Diabetic retinopathy is a leading cause of vision loss.
• Hard exudates are a common clinical sign in diabetic retinopathy.
• The impact of hard exudates on retinal function is not fully understood.

Purpose of the Study:

• To evaluate retinal sensitivity over hard exudates.
• To correlate retinal sensitivity with spectral domain optical coherence tomography (SD-OCT) findings.
• To assess the relationship between hard exudate size and retinal sensitivity in diabetic retinopathy.

Main Methods:

• Twelve eyes from 10 patients with diabetic retinopathy and hard exudates were studied.
• Spectral domain optical coherence tomography (SD-OCT) and microperimetry were performed.
• Retinal sensitivity was measured over hard exudates and compared to unaffected areas.

Main Results:

• Retinal sensitivity was significantly reduced over hard exudates (P = 0.0001).
• No significant correlation was found between hard exudate size and retinal sensitivity (r=-0.23, P = 0.45).
• Retinal sensitivity negatively correlated with retinal thickness (r=-0.65, P = 0.05) and foveal thickness (r=-0.91, P = 0.001).

Conclusions:

• Hard exudates and associated retinal thickening reduce retinal sensitivity in diabetic retinopathy.
• The size of hard exudates does not correlate with the degree of sensitivity reduction.
• SD-OCT and microperimetry are valuable tools for assessing functional deficits in diabetic retinopathy.