---
title: "init(amount:angle:eye:)"
framework: healthkit
role: symbol
role_heading: Initializer
path: "healthkit/hkvisionprism/init(amount:angle:eye:)"
---

# init(amount:angle:eye:)

Creates a new vision prism object, using a single quantity and an alignment angle.

## Declaration

```swift
init(amount: HKQuantity, angle: HKQuantity, eye: HKVisionEye)
```

## Parameters

- `amount`: The strength of the correction, measured in doc://com.apple.healthkit/documentation/HealthKit/HKUnit/prismDiopter() units.
- `angle`: The orientation of the adjustment, measured in doc://com.apple.healthkit/documentation/HealthKit/HKUnit/degreeAngle() units.
- `eye`: A value indicating which eye the correction applies to: doc://com.apple.healthkit/documentation/HealthKit/HKVisionEye/left or doc://com.apple.healthkit/documentation/HealthKit/HKVisionEye/right.

## See Also

### Creating vision prism objects

- [init(verticalAmount:verticalBase:horizontalAmount:horizontalBase:eye:)](healthkit/hkvisionprism/init(verticalamount:verticalbase:horizontalamount:horizontalbase:eye:).md)