<?xml version="1.0" encoding="UTF-8"?>
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/*
  Copyright (c) 2011+, HL7, Inc.
  All rights reserved.
  
  Redistribution and use in source and binary forms, with or without modification, 
  are permitted provided that the following conditions are met:
  
   * Redistributions of source code must retain the above copyright notice, this 
     list of conditions and the following disclaimer.
   * Redistributions in binary form must reproduce the above copyright notice, 
     this list of conditions and the following disclaimer in the documentation 
     and/or other materials provided with the distribution.
   * Neither the name of HL7 nor the names of its contributors may be used to 
     endorse or promote products derived from this software without specific 
     prior written permission.
  
  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
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  Generated on Tue, Jun 16, 2026 19:54+0000 for FHIR v6.0.0-ballot4 

  Note: the schemas &amp; schematrons do not contain all of the rules about what makes resources
  valid. Implementers will still need to be familiar with the content of the specification and with
  any profiles that apply to the resources in order to make a conformant implementation.

-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://hl7.org/fhir" xmlns:xhtml="http://www.w3.org/1999/xhtml" targetNamespace="http://hl7.org/fhir" elementFormDefault="qualified" version="1.0">
  <xs:include schemaLocation="fhir-base.xsd"/>
  <xs:element name="VisionPrescription" type="VisionPrescription">
    <xs:annotation>
      <xs:documentation xml:lang="en">An authorization for the provision of glasses and/or contact lenses to a patient.</xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name="VisionPrescription">
    <xs:annotation>
      <xs:documentation xml:lang="en">An authorization for the provision of glasses and/or contact lenses to a patient.</xs:documentation>
      <xs:documentation xml:lang="en">If the element is present, it must have either a @value, an @id, or extensions</xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base="DomainResource">
        <xs:sequence>
          <xs:element name="identifier" minOccurs="0" maxOccurs="unbounded" type="Identifier">
            <xs:annotation>
              <xs:documentation xml:lang="en">A unique identifier assigned to this vision prescription.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="basedOn" minOccurs="0" maxOccurs="unbounded" type="Reference">
            <xs:annotation>
              <xs:documentation xml:lang="en">Plan/proposal/order/request fulfilled by this prescription.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="groupIdentifier" minOccurs="0" maxOccurs="1" type="Identifier">
            <xs:annotation>
              <xs:documentation xml:lang="en">A shared identifier common to all Vision Prescriptions that were authorized more or less simultaneously by a single author, representing the composite or group identifier.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="status" minOccurs="1" maxOccurs="1" type="FinancialResourceStatusCodes">
            <xs:annotation>
              <xs:documentation xml:lang="en">The status of the resource instance.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="priority" minOccurs="0" maxOccurs="1" type="RequestPriority">
            <xs:annotation>
              <xs:documentation xml:lang="en">Indicates how quickly the vision prescription should be addressed with respect to other requests.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="created" minOccurs="1" maxOccurs="1" type="dateTime">
            <xs:annotation>
              <xs:documentation xml:lang="en">The date this resource was created.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="patient" minOccurs="1" maxOccurs="1" type="Reference">
            <xs:annotation>
              <xs:documentation xml:lang="en">A resource reference to the person to whom the vision prescription applies.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="encounter" minOccurs="0" maxOccurs="1" type="Reference">
            <xs:annotation>
              <xs:documentation xml:lang="en">A reference to a resource that identifies the particular occurrence of contact between patient and health care provider during which the prescription was issued.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="dateWritten" minOccurs="1" maxOccurs="1" type="dateTime">
            <xs:annotation>
              <xs:documentation xml:lang="en">The date (and perhaps time) when the prescription was written.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="effectiveEndDate" minOccurs="0" maxOccurs="1" type="dateTime">
            <xs:annotation>
              <xs:documentation xml:lang="en">The date/time after which the prescription is considered expired and can no longer be used to obtain lenses.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="prescriber" minOccurs="1" maxOccurs="1" type="Reference">
            <xs:annotation>
              <xs:documentation xml:lang="en">The healthcare professional responsible for authorizing the prescription.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="lensSpecification" type="VisionPrescription.LensSpecification" minOccurs="1" maxOccurs="unbounded">
            <xs:annotation>
              <xs:documentation xml:lang="en">Contain the details of  the individual lens specifications and serves as the authorization for the fullfillment by certified professionals.</xs:documentation>
           </xs:annotation>
          </xs:element>
        </xs:sequence>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:complexType name="VisionPrescription.LensSpecification">
    <xs:annotation>
      <xs:documentation xml:lang="en">An authorization for the provision of glasses and/or contact lenses to a patient.</xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base="BackboneElement">
        <xs:sequence>
          <xs:element name="product" minOccurs="1" maxOccurs="1" type="CodeableConcept">
            <xs:annotation>
              <xs:documentation xml:lang="en">Identifies the type of vision correction product which is required for the patient.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="eye" minOccurs="1" maxOccurs="1" type="VisionEyes">
            <xs:annotation>
              <xs:documentation xml:lang="en">The eye for which the lens specification applies.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="sphere" minOccurs="0" maxOccurs="1" type="decimal">
            <xs:annotation>
              <xs:documentation xml:lang="en">Lens power measured in dioptres (0.25 units).</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="cylinder" minOccurs="0" maxOccurs="1" type="decimal">
            <xs:annotation>
              <xs:documentation xml:lang="en">Power adjustment for astigmatism measured in dioptres (0.25 units).</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="axis" minOccurs="0" maxOccurs="1" type="integer">
            <xs:annotation>
              <xs:documentation xml:lang="en">Adjustment for astigmatism measured in integer degrees.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="prism" type="VisionPrescription.Prism" minOccurs="0" maxOccurs="unbounded">
            <xs:annotation>
              <xs:documentation xml:lang="en">Allows for adjustment on two axis.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="add" minOccurs="0" maxOccurs="1" type="decimal">
            <xs:annotation>
              <xs:documentation xml:lang="en">Power adjustment for multifocal lenses measured in dioptres (0.25 units).</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="power" minOccurs="0" maxOccurs="1" type="decimal">
            <xs:annotation>
              <xs:documentation xml:lang="en">Contact lens power measured in dioptres (0.25 units).</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="backCurve" minOccurs="0" maxOccurs="1" type="decimal">
            <xs:annotation>
              <xs:documentation xml:lang="en">Back curvature measured in millimetres.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="diameter" minOccurs="0" maxOccurs="1" type="decimal">
            <xs:annotation>
              <xs:documentation xml:lang="en">Contact lens diameter measured in millimetres.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="duration" minOccurs="0" maxOccurs="1" type="Quantity">
            <xs:annotation>
              <xs:documentation xml:lang="en">The recommended maximum wear period for the lens.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="color" minOccurs="0" maxOccurs="1" type="string">
            <xs:annotation>
              <xs:documentation xml:lang="en">Special color or pattern.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="brand" minOccurs="0" maxOccurs="1" type="string">
            <xs:annotation>
              <xs:documentation xml:lang="en">Brand recommendations or restrictions.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="note" minOccurs="0" maxOccurs="unbounded" type="Annotation">
            <xs:annotation>
              <xs:documentation xml:lang="en">Notes for special requirements such as coatings and lens materials.</xs:documentation>
           </xs:annotation>
          </xs:element>
        </xs:sequence>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:complexType name="VisionPrescription.Prism">
    <xs:annotation>
      <xs:documentation xml:lang="en">An authorization for the provision of glasses and/or contact lenses to a patient.</xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base="BackboneElement">
        <xs:sequence>
          <xs:element name="amount" minOccurs="1" maxOccurs="1" type="decimal">
            <xs:annotation>
              <xs:documentation xml:lang="en">Amount of prism to compensate for eye alignment in fractional units.</xs:documentation>
           </xs:annotation>
          </xs:element>
          <xs:element name="base" minOccurs="1" maxOccurs="1" type="VisionBase">
            <xs:annotation>
              <xs:documentation xml:lang="en">The relative base, or reference lens edge, for the prism.</xs:documentation>
           </xs:annotation>
          </xs:element>
        </xs:sequence>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:simpleType name="VisionBaseEnum">
    <xs:restriction base="code-primitive">
      <xs:enumeration value="up">
        <xs:annotation>
          <xs:documentation xml:lang="en">Up</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="down">
        <xs:annotation>
          <xs:documentation xml:lang="en">Down</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="in">
        <xs:annotation>
          <xs:documentation xml:lang="en">In</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="out">
        <xs:annotation>
          <xs:documentation xml:lang="en">Out</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name="VisionBase">
    <xs:annotation>
      <xs:documentation xml:lang="en"></xs:documentation>
      <xs:documentation xml:lang="en">If the element is present, it must have either a @value, an @id, or extensions</xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base="Element">
        <xs:attribute name="value" type="VisionBaseEnum" use="optional"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:simpleType name="VisionEyesEnum">
    <xs:restriction base="code-primitive">
      <xs:enumeration value="right">
        <xs:annotation>
          <xs:documentation xml:lang="en">Right Eye</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="left">
        <xs:annotation>
          <xs:documentation xml:lang="en">Left Eye</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name="VisionEyes">
    <xs:annotation>
      <xs:documentation xml:lang="en"></xs:documentation>
      <xs:documentation xml:lang="en">If the element is present, it must have either a @value, an @id, or extensions</xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base="Element">
        <xs:attribute name="value" type="VisionEyesEnum" use="optional"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
</xs:schema>
