> ## Documentation Index
> Fetch the complete documentation index at: https://docs.metriport.com/llms.txt
> Use this file to discover all available pages before exploring further.

# VisionPrescription

> An authorization for the provision of glasses and/or contact lenses to a patient.

## Properties

| Name                | Required | Type                                                                                                                                    | Description                                            |
| ------------------- | -------- | --------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------ |
| identifier          | No       | [Identifier](/medical-api/fhir/data-types/identifier)\[]                                                                                | Business Identifier for vision prescription            |
| status              | Yes      | code                                                                                                                                    | active / cancelled / draft / entered-in-error          |
| created             | Yes      | dateTime                                                                                                                                | Response creation date                                 |
| patient             | Yes      | Reference\<[Patient](/medical-api/fhir/resources/patient)>                                                                              | Who prescription is for                                |
| encounter           | No       | Reference\<[Encounter](/medical-api/fhir/resources/encounter)>                                                                          | Created during encounter / admission / stay            |
| dateWritten         | Yes      | dateTime                                                                                                                                | When prescription was authorized                       |
| prescriber          | Yes      | Reference\<[Practitioner](/medical-api/fhir/resources/practitioner) / [PractitionerRole](/medical-api/fhir/resources/practitionerrole)> | Who authorized the vision prescription                 |
| lensSpecification   | Yes      | VisionPrescriptionLensSpecification                                                                                                     | Vision lens authorization                              |
| - id                | No       | string                                                                                                                                  | Unique id for inter-element referencing                |
| - extension         | No       | [Extension](/medical-api/fhir/data-types/extension)\[]                                                                                  | Additional content defined by implementations          |
| - modifierExtension | No       | [Extension](/medical-api/fhir/data-types/extension)\[]                                                                                  | Extensions that cannot be ignored even if unrecognized |
| - product           | Yes      | [CodeableConcept](/medical-api/fhir/data-types/codeableconcept)                                                                         | Product to be supplied                                 |
| - eye               | Yes      | code                                                                                                                                    | right / left                                           |
| - sphere            | No       | decimal                                                                                                                                 | Power of the lens                                      |
| - cylinder          | No       | decimal                                                                                                                                 | Lens power for astigmatism                             |
| - axis              | No       | integer                                                                                                                                 | Lens meridian which contain no power for astigmatism   |
| - prism             | No       | VisionPrescriptionLensSpecificationPrism                                                                                                | Eye alignment compensation                             |
| - id                | No       | string                                                                                                                                  | Unique id for inter-element referencing                |
| - extension         | No       | [Extension](/medical-api/fhir/data-types/extension)\[]                                                                                  | Additional content defined by implementations          |
| - modifierExtension | No       | [Extension](/medical-api/fhir/data-types/extension)\[]                                                                                  | Extensions that cannot be ignored even if unrecognized |
| - amount            | Yes      | decimal                                                                                                                                 | Amount of adjustment                                   |
| - base              | Yes      | code                                                                                                                                    | up / down / in / out                                   |
| - add               | No       | decimal                                                                                                                                 | Added power for multifocal levels                      |
| - power             | No       | decimal                                                                                                                                 | Contact lens power                                     |
| - backCurve         | No       | decimal                                                                                                                                 | Contact lens back curvature                            |
| - diameter          | No       | decimal                                                                                                                                 | Contact lens diameter                                  |
| - duration          | No       | [Quantity](/medical-api/fhir/data-types/quantity)                                                                                       | Lens wear duration                                     |
| - color             | No       | string                                                                                                                                  | Color required                                         |
| - brand             | No       | string                                                                                                                                  | Brand required                                         |
| - note              | No       | [Annotation](/medical-api/fhir/data-types/annotation)\[]                                                                                | Notes for coatings                                     |

## Search Parameters

| Name        | Type      | Description                                         | Expression                     |
| ----------- | --------- | --------------------------------------------------- | ------------------------------ |
| identifier  | token     | Return prescriptions with this external identifier  | VisionPrescription.identifier  |
| patient     | reference | The identity of a patient to list dispenses for     | VisionPrescription.patient     |
| encounter   | reference | Return prescriptions with this encounter identifier | VisionPrescription.encounter   |
| datewritten | date      | Return prescriptions written on this date           | VisionPrescription.dateWritten |
| prescriber  | reference | Who authorized the vision prescription              | VisionPrescription.prescriber  |
| status      | token     | The status of the vision prescription               | VisionPrescription.status      |

## Inherited Properties

| Name              | Required | Type                                                   | Description                                            |
| ----------------- | -------- | ------------------------------------------------------ | ------------------------------------------------------ |
| id                | No       | string                                                 | Logical id of this artifact                            |
| meta              | No       | [Meta](/medical-api/fhir/data-types/meta)              | Metadata about the resource                            |
| implicitRules     | No       | uri                                                    | A set of rules under which this content was created    |
| language          | No       | code                                                   | Language of the resource content                       |
| text              | No       | [Narrative](/medical-api/fhir/data-types/narrative)    | Text summary of the resource, for human interpretation |
| contained         | No       | Resource\[]                                            | Contained, inline Resources                            |
| extension         | No       | [Extension](/medical-api/fhir/data-types/extension)\[] | Additional content defined by implementations          |
| modifierExtension | No       | [Extension](/medical-api/fhir/data-types/extension)\[] | Extensions that cannot be ignored                      |

To view the FHIR specification for this resource, see [VisionPrescription](https://www.hl7.org/fhir/StructureDefinition/VisionPrescription).