Pellucid Marginal Degeneration vs Keratoconus: What Patients Should Know

Pellucid Marginal Degeneration vs Keratoconus: What Patients Should Know Pellucid Marginal Degeneration (PMD) and keratoconus are two progressive corneal disorders that can significantly affect vision. Because they share similar symptoms—such as blurred vision, increasing astigmatism, and difficulty seeing clearly—many patients assume they are the same condition. However, PMD and keratoconus have important differences in how […]