{
  "resourceType": "ActivityDefinition",
  "id": "hart-chart",
  "url": "https://bodyiq.dev/fhir/ActivityDefinition/hart-chart",
  "version": "1",
  "name": "HartChart",
  "title": "Hart Chart (Near-Far Accommodative Rock)",
  "status": "draft",
  "experimental": true,
  "description": "A near letter chart and matched far letter chart are placed at distance. The user alternates reading rows on the near and far chart as quickly as possible while maintaining clarity. Trains accommodative facility.",
  "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": "hart-chart",
          "display": "Hart Chart (Near-Far Accommodative Rock)"
        }
      ]
    }
  ],
  "kind": "ServiceRequest",
  "dosage": [
    {
      "text": "5–10 minutes/day as part of an office-based vergence/accommodative program."
    }
  ],
  "usage": "Evidence: moderate.",
  "note": [
    {
      "text": "Letters must be sharp at both distances before moving on"
    },
    {
      "text": "If text stays blurry on switch, slow down — you're outpacing accommodation"
    }
  ]
}