{
  "resourceType": "ActivityDefinition",
  "id": "vor-x2-gaze-stabilization",
  "url": "https://bodyiq.dev/fhir/ActivityDefinition/vor-x2-gaze-stabilization",
  "version": "1",
  "name": "VorX2GazeStabilization",
  "title": "Gaze Stabilization — VOR ×2",
  "status": "draft",
  "experimental": true,
  "description": "Hold a target in front of you and move the head and target in OPPOSITE directions simultaneously while maintaining clear fixation. Doubles the angular demand on the VOR vs ×1.",
  "useContext": [
    {
      "code": {
        "system": "http://terminology.hl7.org/CodeSystem/usage-context-type",
        "code": "user"
      },
      "valueCodeableConcept": {
        "text": "difficulty: intermediate"
      }
    }
  ],
  "topic": [
    {
      "coding": [
        {
          "system": "https://bodyiq.dev/fhir/CodeSystem/exercise",
          "code": "vor-x2-gaze-stabilization",
          "display": "Gaze Stabilization — VOR ×2"
        }
      ]
    }
  ],
  "kind": "ServiceRequest",
  "dosage": [
    {
      "text": "Layer in after VOR×1 is tolerated. 1–2 minutes per direction, multiple times daily."
    }
  ],
  "usage": "Evidence: strong.",
  "note": [
    {
      "text": "Move head and target in opposite directions at the same speed"
    },
    {
      "text": "Target stays sharp — slow down before it blurs"
    }
  ]
}