---
title: "init(rightEyeSpecification:leftEyeSpecification:brand:dateIssued:expirationDate:device:metadata:)"
framework: healthkit
role: symbol
role_heading: Initializer
path: "healthkit/hkcontactsprescription/init(righteyespecification:lefteyespecification:brand:dateissued:expirationdate:device:metadata:)"
---

# init(rightEyeSpecification:leftEyeSpecification:brand:dateIssued:expirationDate:device:metadata:)

Creates a new glasses prescription sample.

## Declaration

```swift
convenience init(rightEyeSpecification: HKContactsLensSpecification?, leftEyeSpecification: HKContactsLensSpecification?, brand: String, dateIssued: Date, expirationDate: Date?, device: HKDevice?, metadata: [String : Any]?)
```

## Parameters

- `rightEyeSpecification`: The lens specification for the right eye.
- `leftEyeSpecification`: The lens specification for the left eye.
- `brand`: The name of the prescribed brand, based on the contact lens fitting.
- `dateIssued`: The date when the doctor issued the prescription.
- `expirationDate`: The date when the prescription expires.
- `device`: The device that generated the sample.
- `metadata`: Additional metadata about the sample.