What Drives Chromatic Aberration

1. Material & Abbe Value

Higher-index materials reduce thickness but lower the Abbe value, increasing color separation.

2. Lens Design & Prescription

Most PALs lack a true prism-neutral zone, so patients experience prism even at straight-ahead gaze.

3. Lens Thickness & Geometry

Thicker lenses in high minus powers refract more steeply and worsen peripheral fringes.

4. Viewing Distance

Prismatic effect grows with distance. Patients can pass in-office tests yet struggle in the real world.