{
  "checked": "2026-11-08",
  "scope": "Educational illustrations of visual patterns. No patient-specific calibration or diagnosis. Clinical examples were retained from the V9 film and checked against NEI patient information.",
  "sources": [
    {
      "url": "https://www.nei.nih.gov/eye-health-information/eye-conditions-and-diseases/low-vision",
      "supports": "Central/peripheral/night/hazy categories; magnification, contrast settings, spoken output, anti-glare aids and rehabilitation."
    },
    {
      "url": "https://www.nei.nih.gov/eye-health-information/eye-conditions-and-diseases/age-related-macular-degeneration",
      "supports": "Macular disease affects central detail and reading/face recognition."
    },
    {
      "url": "https://www.nei.nih.gov/eye-health-information/eye-conditions-and-diseases/glaucoma",
      "supports": "Glaucoma can cause peripheral field loss and blind spots."
    },
    {
      "url": "https://www.nei.nih.gov/eye-health-information/eye-conditions-and-diseases/retinitis-pigmentosa",
      "supports": "RP affects peripheral/night vision; aids and rehabilitation support remaining vision."
    },
    {
      "url": "https://www.nei.nih.gov/eye-health-information/eye-conditions-and-diseases/diabetic-retinopathy",
      "supports": "Retinal bleeding can interrupt vision; diabetic macular oedema affects central detail."
    },
    {
      "url": "https://www.nei.nih.gov/eye-health-information/eye-conditions-and-diseases/cataracts",
      "supports": "Cloudy natural lens, haze/glare and lens replacement surgery. Coexisting eye disease is not erased by reducing the simulated haze."
    },
    {
      "url": "https://www.inf.ufrgs.br/~oliveira/pubs_files/CVD_Simulation/CVD_Simulation.html",
      "doi": "10.1109/TVCG.2009.113",
      "supports": "Machado, Oliveira and Fernandes 2009 colour-vision model. Archived V9 deutan table has 11 levels interpolated in linear-light sRGB. Source site timed out during current web check; numerical table reused from V9, not newly downloaded."
    }
  ],
  "visual_limits": [
    "Quest 3 and 3S do not provide eye tracking. Field masks follow head direction, not gaze.",
    "Grey/black areas are teaching overlays, not a claim that every person perceives a black spot.",
    "Haze uses a contrast-reducing veil, not a calibrated optical cataract model or actual defocus blur.",
    "Combined PFL and haze exposes independent field size and haze settings. Reducing haze leaves the field gap unchanged.",
    "No headset hand vibration is claimed; the tactile arrow refers to real accessible pedestrian-signal hardware.",
    "Colour transformation applies to supported scene materials; the safety/control UI stays readable and unaffected."
  ],
  "narration": "All voices synthetic. Exact V9 clips reused where their words match current behavior. Revised lines generated with the same Aoede voice family and connected Hindi input for Diya."
}