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Simulate cortical visual impairment (CVI) arising from damage to the visual cortex and posterior visual processing pathways. Explore visual complexity reduction, crowding effects based on Bouma's law, and contrast sensitivity loss. Inspect ΔE color shift and chromaticity deviation. Advanced neuro-ophthalmology visualization tool with cortical anatomy, periventricular leukomalacia pathology overview, dorsal and ventral stream dysfunction, and perceptual simulation pipeline.

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Base color
Model & settings
Processing severity50%
Image simulation
Upload JPG/PNG (max 1200×1200). Simulated canvas next to original.
Research notes
Cortical visual impairment (CVI) results from damage to the visual cortex (V1–V4) or posterior visual processing pathways, most commonly from periventricular leukomalacia (PVL) or hypoxic-ischemic encephalopathy (HIE). Visual complexity reduction simulates the difficulty CVI patients experience parsing cluttered visual scenes. Color preference mode emphasizes red/yellow wavelengths preferred by many CVI individuals. Latency mode applies temporal blur to approximate delayed visual processing response.
Swatches — Reference vs Cortical Processing Loss
Reference
HEX: — • RGB: — • xy: —
CVI Sim
HEX: — • RGB: — • xy: —
ΔE (CIE76)
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ΔE (CIEDE2000)
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Deep preview
Reference
Simulated
Chromaticity (CIE xy)
Achromatic axis (to D65)
D65 white point: 0.313, 0.329
Image simulation

Simulations operate in linear sRGB for perceptual correctness. ΔE2000 implemented locally. Visual complexity reduction is applied as a Gaussian blur scaled by Bouma's crowding factor. Use the severity slider to blend from normal (0%) to profound cortical visual processing impairment (100%).

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.