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Simulates yellowing of the crystalline lens, contrast-loss, scatter haze, and spectral attenuation. Includes deep mode, perceptual severity, and ΔE metrics.

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Base color
Model & settings
Severity 60%
Image simulation
JPG/PNG (max 1200px). Right panel shows cataract simulation.
Research notes
Cataract vision loss arises from progressive lens brunescence and intra-ocular light scatter.
  • Lens yellowing attenuates short-wave (blue) energy.
  • Veiling glare adds diffuse white scatter and reduces contrast.
  • Energy loss lowers effective retinal luminance.
The severity model blends spectral filtering and scattering using perceptual weighting. Severity is a proxy for nuclear cataract grade (LOCS III scale). This is a research-oriented approximation, not a clinical diagnostic.
Swatches — Reference vs Cataract
Reference
HEX: — • RGB: —
Cataract
HEX: — • RGB: —
ΔE76
—
ΔE2000
—
Deep preview
Reference
Cataract
Chromaticity (CIE xy)
Reference xy
x: — • y: —
Simulated xy
x: — • y: —
Cataract yellowing shifts chromaticity toward longer wavelengths by attenuating short-wave energy.
Image simulation

Cataract model combines spectral yellowing (blue-light loss), scattering haze (contrast reduction), and optional deep multi-pass thickening. Simulations operate in linear sRGB. ΔE2000 implemented locally. Illustrative research model only.

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 color swatches are shown.