🔷 Regular vs Irregular Astigmatism Differential Simulator

The Symmetric Cornea — Two Clean Meridians of Curvature

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• 2: Meridian axes (placeholder note)
• Symmetric: Curvature pattern (placeholder note)
• ~30%: Prevalence (placeholder note)
• Genetic: Typical cause (placeholder note)

How regular astigmatism forms

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Cylindrical Lenses — Matching a Predictable Optical Error

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• Toric: Lens type (placeholder note)
• High: Correction accuracy (placeholder note)
• Low: Fit complexity (placeholder note)
• 20/20: Visual outcome (placeholder note)

Why standard lenses work here

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Chaotic Surfaces — When Curvature Has No Clean Axis

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• Many: Meridian axes (placeholder note)
• Chaotic: Curvature pattern (placeholder note)
• Keratoconus: Common source (placeholder note)
• Poor: Standard lens fit (placeholder note)

How irregular astigmatism forms

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Trauma, Infection, and Progressive Thinning

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• Keratoconus: Leading cause (placeholder note)
• Teens–30s: Onset age (placeholder note)
• Gradual: Progression (placeholder note)
• Trauma/infection: Scar origin (placeholder note)

Underlying causes summarized

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Scleral Lenses and Surgery — Rebuilding a Usable Optic

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• RGP/Scleral: Lens option (placeholder note)
• Cross-linking: Surgical option (placeholder note)
• High: Fit complexity (placeholder note)
• Moderate: Outcome variability (placeholder note)

Choosing a correction pathway

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Placeholder callout: severe irregularity usually needs rigid or scleral lenses.