Right Lens prescription using the parameters element

{
  "resourceType": "DeviceRequest",
  "id": "right-lens",
  "text": {
    "status": "generated",
    "div": "<div xmlns=\"http://www.w3.org/1999/xhtml\"><p><b>Generated Narrative with Details</b></p><p><b>id</b>: right-lens</p><p><b>identifier</b>: 15013R</p><p><b>groupIdentifier</b>: 15013</p><p><b>status</b>: completed</p><p><b>intent</b>: original-order</p><p><b>code</b>: Lens <span>(Details : {http://terminology.hl7.org/CodeSystem/ex-visionprescriptionproduct code 'lens' = 'Lens)</span></p><blockquote><p><b>parameter</b></p><p><b>code</b>: sphere, right lens <span>(Details : {LOINC code '28826-6' = 'Sphere distance Glasses prescription.lens - right', given as 'Sphere distance Glasses prescription.lens - right'})</span></p><p><b>value</b>: -2.00 Diopter<span> (Details: UCUM code [diop] = 'diop')</span></p></blockquote><blockquote><p><b>parameter</b></p><p><b>code</b>: prisms, right lens <span>(Details : {LOINC code '28829-0' = 'Prism base distance Glasses prescription.lens - right', given as 'Prism base distance Glasses prescription.lens - right'})</span></p><p><b>value</b>: -2.00 Diopter<span> (Details: UCUM code [diop] = 'diop')</span></p></blockquote><blockquote><p><b>parameter</b></p><p><b>code</b>: add, right lens <span>(Details : {LOINC code '28810-0' = 'Add 1 LM glasses lens - right', given as 'Add 1 LM glasses lens - right'})</span></p><p><b>value</b>: 2.00 Diopter<span> (Details: UCUM code [diop] = 'diop')</span></p></blockquote><p><b>subject</b>: <a>Patient/example</a></p><p><b>occurrence</b>: 15/06/2014</p><p><b>requester</b>: <a>Practitioner/example</a></p></div>"

  "resourceType" : "DeviceRequest",
  "id" : "right-lens",
  "identifier" : [{
    "system" : "http://www.happysight.com/prescription",
    "value" : "15013R"
  }],
  "groupIdentifier" : {
    "system" : "http://acme.org",
    "value" : "15013"

  },
  "identifier": [
    {
      "system": "http://www.happysight.com/prescription",
      "value": "15013R"
    }
  ],
  "groupIdentifier": {
    "system": "http://acme.org",
    "value": "15013"

  "status" : "completed",
  "intent" : "original-order",
  "productCodeableConcept" : {
    "coding" : [{
      "system" : "http://terminology.hl7.org/CodeSystem/ex-visionprescriptionproduct",
      "code" : "lens"
    }]

  },
  "status": "completed",
  "intent": "original-order",
  "codeCodeableConcept": {
    "coding": [
      {
        "system": "http://terminology.hl7.org/CodeSystem/ex-visionprescriptionproduct",
        "code": "lens"
      }
    ]

  "parameter" : [{
    "code" : {
      "coding" : [{
        "system" : "http://loinc.org",
        "code" : "28826-6",
        "display" : "Right glasses lens prescription Sphere far"
      }],
      "text" : "sphere, right lens"
    },
    "valueQuantity" : {
      "value" : -2.00,
      "unit" : "Diopter",
      "system" : "http://unitsofmeasure.org",
      "code" : "[diop]"
    }

  },
  "parameter": [
    {
      "code": {
        "coding": [
          {
            "system": "http://loinc.org",
            "code": "28826-6",
            "display": "Sphere distance Glasses prescription.lens - right"
          }
        ],
        "text": "sphere, right lens"
      },
      "valueQuantity": {
        "value": -2.00,
        "unit": "Diopter",
        "system": "http://unitsofmeasure.org",
        "code": "[diop]"
      }

  {
    "code" : {
      "coding" : [{
        "system" : "http://loinc.org",
        "code" : "28829-0",
        "display" : "Right glasses lens prescription Prism base direction"
      }],
      "text" : "prisms, right lens"

    },
    {
      "code": {
        "coding": [
          {
            "system": "http://loinc.org",
            "code": "28829-0",
            "display": "Prism base distance Glasses prescription.lens - right"
          }
        ],
        "text": "prisms, right lens"
      },
      "valueQuantity": {
        "value": -2.00,
        "unit": "Diopter",
        "system": "http://unitsofmeasure.org",
        "code": "[diop]"
      }

    "valueQuantity" : {
      "value" : -2.00,
      "unit" : "Diopter",
      "system" : "http://unitsofmeasure.org",
      "code" : "[diop]"
    }
  },
  {
    "code" : {
      "coding" : [{
        "system" : "http://loinc.org",
        "code" : "28810-0",
        "display" : "Right corrective lens Add 1 by Lensmeter"
      }],
      "text" : "add, right lens"

    },
    {
      "code": {
        "coding": [
          {
            "system": "http://loinc.org",
            "code": "28810-0",
            "display": "Add 1 LM glasses lens - right"
          }
        ],
        "text": "add, right lens"
      },
      "valueQuantity": {
        "value": 2.00,
        "unit": "Diopter",
        "system": "http://unitsofmeasure.org",
        "code": "[diop]"
      }

    "valueQuantity" : {
      "value" : 2.00,
      "unit" : "Diopter",
      "system" : "http://unitsofmeasure.org",
      "code" : "[diop]"

    }
  ],
  "subject": {
    "reference": "Patient/example"

  }],
  "subject" : {
    "reference" : "Patient/example"

  },
  "occurrenceDateTime": "2014-06-15",
  "requester": {
    "reference": "Practitioner/example"

  "occurrenceDateTime" : "2014-06-15",
  "requester" : {
    "reference" : "Practitioner/example"

  }
}