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: DeviceRequest</b><a name=\"right-lens\"> </a></p><div style=\"display: inline-block; background-color: #d9e0e7; padding: 6px; margin: 4px; border: 1px solid #8da1b4; border-radius: 5px; line-height: 60%\"><p style=\"margin-bottom: 0px\">Resource DeviceRequest &quot;right-lens&quot; </p></div><p><b>identifier</b>: id: 15013R</p><p><b>groupIdentifier</b>: <span title=\"  insert contents here  \">id: 15013</span></p><p><b>status</b>: completed</p><p><b>intent</b>: original-order</p><h3>Codes</h3><table class=\"grid\"><tr><td>-</td><td><b>Concept</b></td></tr><tr><td>*</td><td>Lens <span style=\"background: LightGoldenRodYellow; margin: 4px; border: 1px solid khaki\"> (<a href=\"http://terminology.hl7.org/3.1.0/CodeSystem-ex-visionprescriptionproduct.html\">Example Vision Prescription Product Codes</a>#lens)</span></td></tr></table><blockquote><p><b>parameter</b></p><p><b>code</b>: sphere, right lens <span style=\"background: LightGoldenRodYellow; margin: 4px; border: 1px solid khaki\"> (<a href=\"https://loinc.org/\">LOINC</a>#28826-6 &quot;Sphere distance Glasses prescription.lens - right&quot;)</span></p><p><b>value</b>: -2.00 Diopter<span style=\"background: LightGoldenRodYellow\"> (Details: UCUM code [diop] = 'diop')</span></p></blockquote><blockquote><p><b>parameter</b></p><p><b>code</b>: prisms, right lens <span style=\"background: LightGoldenRodYellow; margin: 4px; border: 1px solid khaki\"> (<a href=\"https://loinc.org/\">LOINC</a>#28829-0 &quot;Prism base distance Glasses prescription.lens - right&quot;)</span></p><p><b>value</b>: -2.00 Diopter<span style=\"background: LightGoldenRodYellow\"> (Details: UCUM code [diop] = 'diop')</span></p></blockquote><blockquote><p><b>parameter</b></p><p><b>code</b>: add, right lens <span style=\"background: LightGoldenRodYellow; margin: 4px; border: 1px solid khaki\"> (<a href=\"https://loinc.org/\">LOINC</a>#28810-0 &quot;Add 1 LM glasses lens - right&quot;)</span></p><p><b>value</b>: 2.00 Diopter<span style=\"background: LightGoldenRodYellow\"> (Details: UCUM code [diop] = 'diop')</span></p></blockquote><p><b>subject</b>: <a href=\"patient-example.html\">Patient/example</a> &quot;Peter CHALMERS&quot;</p><p><b>occurrence</b>: 2014-06-15</p><p><b>requester</b>: <a href=\"practitioner-example.html\">Practitioner/example</a> &quot;Adam CAREFUL&quot;</p></div>"
  },
  "identifier": [
    {
      "system": "http://www.happysight.com/prescription",
      "value": "15013R"
    }
  ],
  "groupIdentifier": {
    "system": "http://acme.org",
    "value": "15013"
  },
  "status": "completed",
  "intent": "original-order",
  "code": {
    "concept": {
      "coding": [
        {
          "system": "http://terminology.hl7.org/CodeSystem/ex-visionprescriptionproduct",
          "code": "lens"
        }
      ]
    }
  },
  "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": "Prism base distance Glasses prescription.lens - right"
          }
        ],
        "text": "prisms, right lens"
      },
      "valueQuantity": {
        "value": -2.00,
        "unit": "Diopter",
        "system": "http://unitsofmeasure.org",
        "code": "[diop]"
      }
    },
    {
      "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]"
      }
    }
  ],
  "subject": {
    "reference": "Patient/example"
  },
  "occurrenceDateTime": "2014-06-15",
  "requester": {
    "reference": "Practitioner/example"
  }
}