Base color

Cataract type & settings

Cataract type

Severity100%

Perceptual severity curve Multi-pass deep Forward scatter / glare

Image simulation

Choose image Upload JPG/PNG (max 1200×1200). Simulated canvas next to original.

Research notes

Congenital cataract is opacification of the crystalline lens present at birth or developing in early infancy. Lens protein aggregation (especially crystallins) creates Mie scatter that reduces contrast, adds veiling luminance, and in dense opacities causes leukocoria. Nuclear cataract scatters paraxial rays blurring central vision; lamellar affects an annular zone; posterior subcapsular is most visually disabling (near and distance). The scatter checkbox applies sigmoid forward-scatter veiling glare.

Swatches — Reference vs Congenital Cataract

Reference

HEX: — • RGB: — • xy: —

Cataract

HEX: — • RGB: — • xy: —

ΔE (CIE76)

—

ΔE (CIEDE2000)

—

Deep preview

Reference

Simulated

Chromaticity (CIE xy)

Lens scatter axis (toward D65 white)

D65 white point: 0.313, 0.329

Image simulation

Simulations operate in linear sRGB. Nuclear cataract applies central Gaussian blur plus slight short-wave absorption (yellowing); lamellar mode applies annular mid-zone blur with preserved central and peripheral regions; posterior subcapsular mode applies strong near-axis forward scatter blur. The scatter checkbox adds sigmoid additive veiling luminance from Mie forward scatter. ΔE2000 measures perceptual shift from lens opacification.

Multi-condition comparison

Condition A

Condition B

Steps

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.

Advanced mode

Severity curve

Curve param

Channel weights (R,G,B)

Clinical notes: Nuclear cataract produces mild short-wave (S/B channel) absorption — nuclear sclerosis yellows the lens, reducing blue transmission (cc-w-s=0.95). Lamellar and posterior subcapsular cataracts are spectrally neutral (achromatic Mie scatter). The scatter checkbox adds a sigmoid additive white veil. Not validated against clinical photometry.

Model assumptions & limits

Mie scatter is approximated by Gaussian blur + additive veil; real lens scatter has a highly forward-directed angular distribution that changes with particle size and scatterer concentration.
Nuclear yellowing is approximated by mild S-channel attenuation; real brunescent nuclear cataracts absorb across the 400–500 nm range with progressive β-crystallin cross-linking.
ΔE and chromaticity measures depend on display calibration and ambient illumination.