RETINAL DISEASES EXPLAINED
Understand the four primary conditions diagnosed by OCTalyze. Learn how each disease develops, what it looks like on an optical coherence tomography (OCT) scan, and what action is required.
Diabetic Macular Edema (DME)
Fluid buildup and swelling inside the retina caused by diabetes.
What Is It in Simple Terms?
High blood sugar levels damage the tiny delicate blood vessels in the back of the eye. These weakened capillaries leak fluid and blood into the central retina (macula), causing it to swell up like a wet sponge.
Everyday Analogy
“Like a soaked sponge swelling up under water — when the retina swells, the light sensors cannot focus properly, resulting in blurry or distorted vision.”
What Doctors See on the OCT Scan
Dark, cyst-like fluid cavities (black circles or bubbles) trapped between retinal layers, accompanied by visible thickening and swelling of the central retina.
Common Patient Symptoms
- •Blurred or double vision that fluctuates throughout the day
- •Straight lines appearing wavy or crooked (metamorphopsia)
- •Colors appearing faded, washed out, or dull
- •Difficulty reading small text or recognizing faces
Underlying Causes & Risks
- •Prolonged high blood sugar levels (Type 1 or Type 2 Diabetes)
- •Elevated blood pressure (hypertension) and high cholesterol
- •Diabetic retinopathy progressing to microvascular leakage
Anti-VEGF intravitreal injections, retinal laser therapy, and tight glycemic blood sugar management.
4-Class Quick Comparison Table
Side-by-side breakdown for rapid clinician and patient reference
| Condition | What Happens? | Key OCT Sign | Urgency Tier | Standard Treatment |
|---|---|---|---|---|
| NORMALNormal & Healthy Retina | A completely healthy retina where light is focused sharply without any swelling, fluid leakage, or debris. All 10 microscopic retinal cell layers lie in smooth, parallel stripes. | Smooth, continuous horizontal layers with a gentle, natural dip in the center (the fovea). No dark fluid bubbles or bumpy elevations. | LOW RISK / HEALTHY | Standard annual ophthalmological check-ups to maintain healthy baseline. |
| DMEDiabetic Macular Edema (DME) | High blood sugar levels damage the tiny delicate blood vessels in the back of the eye. These weakened capillaries leak fluid and blood into the central retina (macula), causing it to swell up like a wet sponge. | Dark, cyst-like fluid cavities (black circles or bubbles) trapped between retinal layers, accompanied by visible thickening and swelling of the central retina. | HIGH PRIORITY | Anti-VEGF intravitreal injections, retinal laser therapy, and tight glycemic blood sugar management. |
| DRUSENDrusen (Dry Age-Related Macular Degeneration) | As the eye ages, cellular waste products (fats and proteins) aren't cleared away effectively. They form tiny yellow pebble-like deposits called drusen underneath the retinal pigment epithelium layer. | Convex nodular bumps and dome-shaped elevations pushing up the bottom retinal layer (RPE), making the normally straight lines appear wavy. | CLINICAL REVIEW | Regular OCT monitoring every 6-12 months using Amsler grid self-tests, dietary antioxidants (AREDS2 vitamins), and lifestyle changes. |
| CNVChoroidal Neovascularization (Wet AMD) | In response to oxygen starvation, the eye grows abnormal new blood vessels under the retina. These vessels are fragile and easily break, leaking blood and fluid directly into the retinal tissue, causing rapid central vision damage. | A prominent thick, bright (hyperreflective) mass breaking through Bruch's membrane, frequently surrounded by dark fluid pooling above and below the retinal layers. | CRITICAL / URGENT | Urgent anti-VEGF eye injections (e.g., Aflibercept, Ranibizumab) administered by a retinal specialist within days to prevent permanent vision loss. |