👁️ Diabetic Macular Edema Simulator

Chronic Hyperglycemia Damages Retinal Capillaries

Placeholder: sustained high glucose injures small vessel walls.

• HbA1c: Trigger (Chronic glucose exposure)
• Endothelium: Target (Capillary wall cells)
• Years: Onset (Cumulative damage)
• Duration: Risk driver (Longer disease, more harm)

Vascular injury mechanism

Placeholder: hyperglycemia thickens basement membranes and weakens pericytes.

Placeholder: better glycemic control slows early capillary injury.

Capillary Walls Become Increasingly Permeable

Placeholder: tight junctions loosen, letting fluid escape vessels.

• Loosened: Junctions (Tight junction breakdown)
• Weakened: Barrier (Blood-retinal barrier)
• VEGF: Mediator (Vascular permeability factor)
• Rising: Trend (With poor HbA1c control)

Permeability escalation

Placeholder: VEGF upregulation drives progressive vessel leakiness.

Placeholder: permeability rises faster with higher HbA1c.

Plasma Fluid Leaks Toward the Macula

Placeholder: leaking capillaries send fluid into central retina.

• Centripetal: Direction (Toward macula)
• Plasma: Carrier (Protein-rich fluid)
• Macula: Location (Central vision zone)
• Progressive: Pace (Accumulates over time)

Fluid migration

Placeholder: leaked fluid diffuses through retinal layers toward fovea.

Placeholder: fluid accumulation tracks glycemic control closely.

Fluid Pools Into Macular Cysts

Placeholder: pooled fluid forms cystic spaces, thickening the macula.

• Cysts: Structure (Fluid-filled pockets)
• ~250 μm: Normal OCT (Baseline macular thickness)
• >400 μm: Edema OCT (Clinically significant edema)
• OCT scan: Detection (Cross-section imaging)

Edema formation

Placeholder: cystoid spaces form between retinal layers as fluid pools.

Placeholder: macular thickness rises sharply once cysts form.

Swollen Macula Distorts Central Vision

Placeholder: thickened macula blurs and warps fine central detail.

• Blur: Symptom (Central visual field)
• Metamorphopsia: Symptom (Line distortion)
• HbA1c + years: Severity link (Combined risk factors)
• Glycemic control: Management (Slows progression)

Visual consequence

Placeholder: distorted photoreceptor alignment degrades central acuity.

Placeholder: early control of HbA1c preserves central vision longest.