Understanding nonproliferative diabetic retinopathy progression using noninvasive imaging.

Area of Science:

• Ophthalmology
• Diabetology
• Vascular Biology

Background:

• Diabetic retinopathy (DR) affects a subset of diabetes patients, leading to vision loss.
• The Early Treatment Diabetic Retinopathy Study (ETDRS) scale is the standard for grading DR progression.
• DR pathogenesis involves neurodegeneration, blood-retinal barrier alterations, and ischemia.

Purpose of the Study:

• To identify patients at risk of rapid diabetic retinopathy progression and vision loss.
• To understand the progression of ischemic diabetic retinopathy phenotypes.
• To inform strategies for preventing vision-threatening complications.

Main Methods:

• Conceptual classification of fundus abnormalities into neurodegeneration, blood-retinal barrier alteration, and ischemia phenotypes.
• Description of ischemic DR progression: hypoperfusion, deep capillary plexus involvement, and hyperperfusion response.
• Analysis of microvascular changes leading to clinically significant macular edema (CSME) and proliferative diabetic retinopathy (PDR).

Main Results:

• Ischemic DR progresses from hypoperfusion to hyperperfusion with dilated shunt vessels and intraretinal microvascular abnormalities.
• Visual acuity is maintained until CSME or PDR develops.
• Microvascular changes are key drivers of vision-threatening complications.

Conclusions:

• Preventing vision loss in diabetic retinopathy may involve halting progressive ischemia or targeting angiogenic/inflammatory responses.
• Early identification of rapid progression in ischemic DR is critical for intervention.
• Understanding DR phenotypes aids in developing targeted preventative strategies.