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Simulate homonymous hemianopia arising from post-chiasmal lesions of the optic tract, lateral geniculate nucleus, optic radiations, or visual cortex. Explore complete same-sided hemifield loss, quadrantanopia patterns, and macular sparing. Inspect ΔE color shift and chromaticity deviation. Advanced neuro-ophthalmology visualization tool with retinotopic cortical mapping, stroke and TBI pathology overview, and perimetry-based simulation pipeline.

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Base color
Model & settings
Field loss severity50%
Image simulation
Upload JPG/PNG (max 1200×1200). Simulated canvas next to original.
Research notes
Homonymous hemianopia results from damage to the post-chiasmal visual pathway — optic tract, lateral geniculate nucleus, optic radiations, or visual cortex — causing loss of the same half-field in both eyes. Macular sparing occurs in occipital cortex lesions due to dual vascular supply (MCA and PCA). Gradual edge mode simulates incomplete lesions or recovering field margins.
Swatches — Reference vs Same-Sided Field Loss
Reference
HEX: — • RGB: — • xy: —
Field Loss 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. Hemifield attenuation is applied as a unilateral vertical mask respecting the visual midline. Macular sparing preserves the central 5° around fixation. Use the severity slider to blend from normal (0%) to complete homonymous hemianopia (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.