{
  "resourceType": "ActivityDefinition",
  "id": "eye-break-20-20-20",
  "url": "https://bodyiq.dev/fhir/ActivityDefinition/eye-break-20-20-20",
  "version": "1",
  "name": "EyeBreak202020",
  "title": "20-20-20 Eye Break",
  "status": "draft",
  "experimental": true,
  "description": "Every 20 minutes of screen time, look at an object at least 20 feet away for at least 20 seconds. Relaxes the ciliary muscle and breaks accommodative fixation.",
  "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": "eye-break-20-20-20",
          "display": "20-20-20 Eye Break"
        }
      ]
    }
  ],
  "kind": "ServiceRequest",
  "dosage": [
    {
      "text": "20 s every 20 min of screen work (AAO recommendation)."
    }
  ],
  "usage": "Evidence: moderate.",
  "note": [
    {
      "text": "Pick a specific distant target — a building, tree, or fixture"
    },
    {
      "text": "Blink fully a few times during the gaze — screens reduce blink rate"
    }
  ]
}