{
  "resourceType": "StructureDefinition",
  "id": "ncdhc-observation-left-eye-visiual-acuity",
  "url": "http://hl7.org.au/fhir/ch/v1/StructureDefinition/ncdhc-observation-left-eye-visiual-acuity",
  "version": "r1.0.0",
  "name": "NCDHCLeftEyeVisualAcuityObservationProfile",
  "title": "NCDHC Left Eye Visual Acuity Observation",
  "status": "draft",
  "date": "2019-11-22",
  "publisher": "National Children's Digital Health Collaborative (NCDHC)",
  "description": "NCDHC Left Eye Visual Acuity test",
  "purpose": "To record Vision Screen result",
 "fhirVersion": "3.0.2",
  "kind": "resource",
  "abstract": false,
  "type": "Observation",
  "baseDefinition": "http://hl7.org.au/fhir/ch/v1/StructureDefinition/ncdhc-observation-base",
  "derivation": "constraint",
  "differential": {
    "element": [
      {
        "id": "Observation",
        "path": "Observation",
        "short": "NCDHC Left Eye Visual Acuity Observation Profile"
      },
      {
        "id": "Observation.category",
        "path": "Observation.category",
        "patternCodeableConcept": {
          "text": ""
        }
      },
      {
        "id": "Observation.code",
        "path": "Observation.code",
        "mustSupport": true
      },
      {
        "id": "Observation.code.coding",
        "path": "Observation.code.coding",
        "slicing": {
          "discriminator": [
            {
              "type": "pattern",
              "path": "code"
            },
            {
              "type": "value",
              "path": "system"
            }
          ],
          "rules": "open"
        }
      },
      {
        "id": "Observation.code.coding:VisualAcuityLeftEyeSNOMED-CT",
        "path": "Observation.code.coding",
        "sliceName": "VisualAcuityLeftEyeSNOMED-CT",
        "min": 1,
        "max": "1",
        "patternCoding": {
          "system": "http://snomed.info/sct",
          "code": "386708005"
        }
      },
      {
        "id": "Observation.code.coding:VisualAcuityLeftEyeSNOMED-CT.system",
        "path": "Observation.code.coding.system",
        "min": 1,
        "fixedUri": "http://snomed.info/sct"
      },
      {
        "id": "Observation.code.coding:VisualAcuityLeftEyeSNOMED-CT.code",
        "path": "Observation.code.coding.code",
        "min": 1
      },
      {
        "id": "Observation.subject",
        "path": "Observation.subject",
        "short": "Reference to the Baby Patient",
        "type": [
          {
            "code": "Reference",
            "targetProfile": "http://hl7.org.au/fhir/ch/v1/StructureDefinition/ncdhc-patient-baby"
          }
        ]
      },
      {
        "id": "Observation.effectiveDateTime:effectiveDateTime",
        "path": "Observation.effectiveDateTime",
        "sliceName": "effectiveDateTime",
        "short": "Date when Right Eye Visual Acuity assessment was performed"
      },
      {
        "id": "Observation.value[x]:valueCodeableConcept",
        "path": "Observation.valueCodeableConcept",
        "sliceName": "valueCodeableConcept",
        "short": "Completed | Not Completed",
        "type": [
          {
            "code": "CodeableConcept"
          }
        ],
        "mustSupport": true,
        "binding": {
          "strength": "required",
          "valueSetReference": {
            "reference": "http://hl7.org.au/fhir/ch/v1/ValueSet/ncdhc-observation-completion-status-1"
          }
        }
      },
      {
        "id": "Observation.interpretation",
        "path": "Observation.interpretation",
        "binding": {
          "strength": "required",
          "valueSetReference": {
            "reference": "http://hl7.org.au/fhir/ch/v1/ValueSet/ncdhc-observation-interpretation-1"
          }
        }
      },
      {
        "id": "Observation.component",
        "path": "Observation.component",
        "slicing": {
          "discriminator": [
            {
              "type": "pattern",
              "path": "code"
            }
          ],
          "rules": "closed"
        },
        "short": "Visual acuity Test type and Result"
      },
      {
        "id": "Observation.component:VisualAcuity3M",
        "path": "Observation.component",
        "sliceName": "VisualAcuity3M",
        "max": "1"
      },
      {
        "id": "Observation.component:VisualAcuity3M.code",
        "path": "Observation.component.code",
        "patternCodeableConcept": {
          "coding": [
            {
              "system": "http://snomed.info/sct",
              "code": "1368901000168106"
            }
          ]
        }
      },
      {
        "id": "Observation.component:VisualAcuity3M.value[x]:valueQuantity",
        "path": "Observation.component.valueQuantity",
        "sliceName": "valueQuantity",
        "type": [
          {
            "code": "Quantity"
          }
        ]
      },
      {
        "id": "Observation.component:VisualAcuity6M",
        "path": "Observation.component",
        "sliceName": "VisualAcuity6M",
        "max": "1"
      },
      {
        "id": "Observation.component:VisualAcuity6M.code",
        "path": "Observation.component.code",
        "patternCodeableConcept": {
          "coding": [
            {
              "system": "http://snomed.info/sct",
              "code": "1368911000168109"
            }
          ]
        }
      },
      {
        "id": "Observation.component:VisualAcuity6M.value[x]:valueQuantity",
        "path": "Observation.component.valueQuantity",
        "sliceName": "valueQuantity",
        "type": [
          {
            "code": "Quantity"
          }
        ]
      }
    ]
  }
}