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Simulate the progressive perceptual changes of the aging eye � crystalline lens yellowing (brunescence), short-wavelength absorption by tryptophan-derived chromophores, increased intraocular scatter, and contrast sensitivity decline. Explore how nuclear sclerosis gradually shifts color perception toward warmer tones and degrades blue-violet discrimination. Inspect Delta-E color shift and chromaticity deviation along the warm axis. Advanced perceptual optics research covering lens transmission spectra, macular pigment interplay, and optical correction strategies including cataract surgery and IOL selection.

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Base color
Model & settings
Shift severity50%
Image simulation
Upload JPG/PNG (max 1200 x 1200). Combined mode adds warm tint and intraocular scatter haze.
Research notes
Age-related lens changes arise from the progressive accumulation of tryptophan photodegradation products � principally 3-hydroxykynurenine O-glucoside (3-OHKG) � within the crystalline lens nucleus. These UV-absorbing chromophores shift spectral transmission rightward, increasing short-wavelength (blue/violet 380-450 nm) absorption. Nuclear sclerosis adds Mie scatter from protein aggregates, reducing contrast sensitivity at high spatial frequencies. The "Perceptual severity curve" applies a sigmoidal mapping. Combined mode approximates forward scatter, warm shift, and luminance loss of moderate nuclear sclerosis. Design accessibility tool � not a clinical diagnostic instrument.
Swatches � Reference vs Age-Related Shift
Reference
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Age Shift Sim
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Delta-E (CIE76)
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Delta-E (CIEDE2000)
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Deep preview
Reference
Simulated
Chromaticity (CIE xy)
Warm shift axis (toward Planckian locus)
D65 white point: 0.313, 0.329
Image simulation

Simulations operate in linear sRGB for perceptual correctness. Delta-E 2000 implemented locally. Lens yellowing is modeled as wavelength-selective blue-channel absorption, shifting chromaticity toward the Planckian locus warm direction. Contrast sensitivity decline is approximated as local contrast attenuation plus Gaussian scatter. Combined mode applies both the warm spectral shift and a scatter convolution approximating intraocular forward scatter from nuclear sclerosis. All models are for perceptual optics research and design accessibility � not for clinical diagnosis.

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.