The Symmetric Cornea — Two Clean Meridians of Curvature
A short placeholder line on regular astigmatism geometry.
- 2: Meridian axes (placeholder note)
- Symmetric: Curvature pattern (placeholder note)
- ~30%: Prevalence (placeholder note)
- Genetic: Typical cause (placeholder note)
How regular astigmatism forms
Short placeholder paragraph on smooth toric corneal curvature.
Cylindrical Lenses — Matching a Predictable Optical Error
A short placeholder line on standard toric lens correction.
- 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
Short placeholder paragraph on symmetric power correction.
Chaotic Surfaces — When Curvature Has No Clean Axis
A short placeholder line on irregular, scarred corneal surfaces.
- 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
Short placeholder paragraph on scarred surface optics.
Trauma, Infection, and Progressive Thinning
A short placeholder line on causes of surface irregularity.
- Keratoconus: Leading cause (placeholder note)
- Teens–30s: Onset age (placeholder note)
- Gradual: Progression (placeholder note)
- Trauma/infection: Scar origin (placeholder note)
Underlying causes summarized
Short placeholder paragraph on keratoconus and scarring.
Scleral Lenses and Surgery — Rebuilding a Usable Optic
A short placeholder line on specialty and surgical correction routes.
- 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
Short placeholder paragraph on specialty lens and surgical fitting.
Placeholder callout: severe irregularity usually needs rigid or scleral lenses.