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Simulate ischemic optic neuropathy (ION) arising from infarction of the optic nerve head or retrolaminar optic nerve. Explore altitudinal visual field loss characteristic of anterior ischemic optic neuropathy (AION), sectoral arcuate loss, and combined altitudinal patterns with contrast attenuation. Covers non-arteritic AION (NA-AION, crowded disc, small cup-to-disc ratio), arteritic AION (A-AION, giant cell arteritis), and posterior ION (PION). Inspect ΔE and chromaticity deviation with posterior ciliary artery anatomy and watershed zone pathophysiology.

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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
Ischemic optic neuropathy (ION) results from infarction of the optic nerve blood supply. Anterior ION (AION) affects the optic disc and nerve head; posterior ION (PION) affects the retrolaminar optic nerve. NA-AION (non-arteritic) is the most common — associated with crowded disc anatomy and vascular risk factors. A-AION (arteritic, giant cell arteritis) requires urgent high-dose corticosteroids to prevent fellow eye involvement. Altitudinal inferior field loss (inferior altitudinal defect) is the classic NA-AION perimetry pattern.
Swatches — Reference vs Altitudinal 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. Altitudinal field attenuation is applied as a horizontal mask respecting the superior/inferior visual field boundary at the horizontal meridian. Contrast attenuation models neural conduction slowing from partial ischemia. Use the severity slider to blend from normal (0%) to complete altitudinal field loss (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.