{
  "resourceType": "ActivityDefinition",
  "id": "smooth-pursuit-tracking",
  "url": "https://bodyiq.dev/fhir/ActivityDefinition/smooth-pursuit-tracking",
  "version": "1",
  "name": "SmoothPursuitTracking",
  "title": "Smooth Pursuit Tracking",
  "status": "draft",
  "experimental": true,
  "description": "Follow a near target with both eyes as it moves slowly and steadily through ~160° horizontally and ~120° vertically, 1–2 ft from the face. Pursuit should be smooth — no jerks, no head turn.",
  "useContext": [
    {
      "code": {
        "system": "http://terminology.hl7.org/CodeSystem/usage-context-type",
        "code": "user"
      },
      "valueCodeableConcept": {
        "text": "difficulty: beginner"
      }
    }
  ],
  "topic": [
    {
      "coding": [
        {
          "system": "https://bodyiq.dev/fhir/CodeSystem/exercise",
          "code": "smooth-pursuit-tracking",
          "display": "Smooth Pursuit Tracking"
        }
      ]
    }
  ],
  "kind": "ServiceRequest",
  "dosage": [
    {
      "text": "2–3 horizontal sweeps + 2–3 vertical sweeps, 1–2×/day."
    }
  ],
  "usage": "Evidence: moderate.",
  "note": [
    {
      "text": "Keep the head still — only the eyes move"
    },
    {
      "text": "Track at a comfortable speed where pursuit stays smooth"
    }
  ]
}