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Simulate keratoconus corneal ectasia across mild irregular astigmatism, moderate cone, and advanced / acute hydrops stages. Tune Amsler-Krumeich severity, explore comatic aberration, monocular polyopia and scatter from ectatic forward protrusion, and inspect ΔE & chromatic shift from scatter and HOA contributions.

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Base color
Ectasia stage & settings
Ectasia severity100%
Image simulation
Upload JPG/PNG (max 1200×1200). Simulated canvas next to original.
Research notes
Keratoconus is a progressive corneal ectasia in which thinning and forward protrusion of the cornea produce increasingly irregular astigmatism. The ectatic cone acts as a prismatic element, producing comatic blurring, monocular polyopia (multiple ghost images), and reduced spectacle-corrected acuity. Mild mode simulates subtle irregular astigmatism; moderate adds pronounced coma blur and polyopia; advanced/hydrops overlays oedema scatter from Descemet membrane rupture. Severity maps to Amsler-Krumeich (AK) grading AK I–IV.
Swatches — Reference vs Keratoconus
Reference
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Simulated
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ΔE (CIE76)
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ΔE (CIEDE2000)
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Deep preview
Reference
Simulated
Chromaticity (CIE xy)
Ectasia scatter axis (toward D65 white)
D65 white point: 0.313, 0.329
Image simulation

Simulations operate in linear sRGB (spatial distortion approximated as directional blur). Mild ectasia applies asymmetric comatic blur; moderate adds monocular polyopia ghosting; advanced/hydrops overlays Gaussian scatter from stromal oedema. ΔE2000 measures perceptual colour shift; primary ectasia effect is spatial/geometric — scatter ΔE driven by advanced stage.

Multi-condition comparison
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Compare normal, Condition A and Condition B across multiple severities. If an image is loaded it will be processed into the grid, otherwise colour swatches are shown.