Eyematics Core Data Set - Local Development build (v2025.0.0-alpha) built by the FHIR (HL7® FHIR® Standard) Build Tools. See the Directory of published versions
Extension: LensDuringVATestSpecification
| Official URL: https://larfuma.github.io/fhir-eyecare-ig/StructureDefinition/LensDuringVATestSpecification | Version: 2025.0.0-alpha | |||
| Draft as of 2025-03-27 | Computable Name: LensDuringVATestSpecification | |||
Specification any Lens that was n front of an eye during a Visual Acuity test test
Context of Use
-
Element ID:
Observation.component.extension
This extension may be used on the following element(s):
Usage info
Usage:
- Use this Extension: Visual Acuity (VA)
Formal Views of Extension Content
Description of Profiles, Differentials, Snapshots, and how the XML and JSON presentations work.
This structure is derived from Extension
| Name | Flags | Card. | Type | Description & Constraints |
|---|---|---|---|---|
  Extension |
0..* | Extension | Extension | |
  Slices for extension |
1..* | Extension | Extension Slice: Unordered, Open by value:url | |
   extension:BasedOn |
0..* | Extension | Where the Lens Data comes fro | |
  extension |
0..0 | |||
| url |
1..1 | uri | "BasedOn" | |
  value[x] |
0..1 | Reference() | Where the Lens Data is coming from | |
| extension:type |
1..1 | Extension | Lens Type (Contact,Spectracle or Trial) | |
| extension |
0..0 | |||
| url |
1..1 | uri | "type" | |
 value[x] |
0..1 | CodeableConcept | Value of extension Binding: VA-Lens-Types (preferred) | |
| extension:sphere |
0..1 | Extension | Power of the lens | |
| extension |
0..0 | |||
| url |
1..1 | uri | "sphere" | |
 value[x] |
0..1 | decimal | Value of extension | |
| extension:cylinder |
0..1 | Extension | Lens power for astigmatism | |
| extension |
0..0 | |||
| url |
1..1 | uri | "cylinder" | |
  value[x] |
0..1 | Value of extension | ||
  valueDecimal |
decimal | |||
 valueQuantity |
Quantity | |||
| extension:axis |
0..1 | Extension | Lens meridian which contain no power for astigmatism | |
| extension |
0..0 | |||
| url |
1..1 | uri | "axis" | |
| value[x] |
0..1 | integer | Value of extension | |
| extension:PrismAmount |
0..1 | Extension | Amount of adjustment | |
| extension |
0..0 | |||
| url |
1..1 | uri | "PrismAmount" | |
| value[x] |
0..1 | decimal | Value of extension | |
| extension:PrismBaseDirection |
0..1 | Extension | The relative base, or reference lens edge, for the prism. | |
| extension |
0..0 | |||
| url |
1..1 | uri | "PrismBaseDirection" | |
| value[x] |
0..1 | CodeableConcept | Value of extension | |
| extension:add |
0..* | Extension | Added power for multifocal levels | |
| extension |
0..0 | |||
| url |
1..1 | uri | "add" | |
| value[x] |
0..1 | decimal | Value of extension | |
| extension:power |
0..1 | Extension | Contact lens power | |
| extension |
0..0 | |||
| url |
1..1 | uri | "power" | |
| value[x] |
0..1 | decimal | Value of extension | |
| extension:backCurve |
0..1 | Extension | Contact lens back curvature | |
| extension |
0..0 | |||
| url |
1..1 | uri | "backCurve" | |
| value[x] |
0..1 | decimal | Value of extension | |
| extension:diameter |
0..1 | Extension | Contact lens diameter | |
| extension |
0..0 | |||
| url |
1..1 | uri | "diameter" | |
| value[x] |
0..1 | decimal | Value of extension | |
| extension:duration |
0..1 | Extension | Lens wear duration | |
| extension |
0..0 | |||
| url |
1..1 | uri | "duration" | |
| value[x] |
0..1 | Quantity | Value of extension | |
| extension:color |
0..* | Extension | Extension | |
| extension |
0..0 | |||
| url |
1..1 | uri | "color" | |
| value[x] |
0..1 | string | Value of extension | |
| extension:brand |
0..* | Extension | Extension | |
| extension |
0..0 | |||
| url |
1..1 | uri | "brand" | |
| value[x] |
0..1 | string | Value of extension | |
 extension:note |
0..* | Extension | Extension | |
| extension |
0..0 | |||
| url |
1..1 | uri | "note" | |
| value[x] |
0..1 | string | Value of extension | |
| url |
1..1 | uri | "https://larfuma.github.io/fhir-eyecare-ig/StructureDefinition/LensDuringVATestSpecification" | |
| value[x] |
0..0 | |||
| Documentation for this format | ||||
Other representations of profile: CSV, Excel, Schematron
Terminology Bindings
| Path | Conformance | ValueSet | URI |
| Extension.extension:type.value[x] | preferred | VS_VA_Lens_Typeshttps://eyematics.org/fhir/eyematics-kds/ValueSet/lens-typesfrom this IG |
Constraints
| Id | Grade | Path(s) | Details | Requirements |
| ele-1 | error | **ALL** elements | All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count()) | |
| ext-1 | error | **ALL** extensions | Must have either extensions or value[x], not both : extension.exists() != value.exists() |