---
title: prismDiopter()
framework: healthkit
role: symbol
role_heading: Type Method
path: healthkit/hkunit/prismdiopter()
---

# prismDiopter()

Returns a HealthKit unit for measuring the prismatic deviation of a lens using prism diopter units.

## Declaration

```swift
class func prismDiopter() -> Self
```

## See Also

### Constructing vision units

- [diopter()](healthkit/hkunit/diopter().md)