---
title: horizontalBase
framework: healthkit
role: symbol
role_heading: Instance Property
path: healthkit/hkvisionprism/horizontalbase
---

# horizontalBase

The orientation of the horizontal portion of the correction.

## Declaration

```swift
var horizontalBase: HKPrismBase { get }
```

## Discussion

Discussion This value can be either HKPrismBase.in or HKPrismBase.out.

## See Also

### Accessing lens specification data

- [eye](healthkit/hkvisionprism/eye.md)
- [HKVisionEye](healthkit/hkvisioneye.md)
- [amount](healthkit/hkvisionprism/amount.md)
- [angle](healthkit/hkvisionprism/angle.md)
- [horizontalAmount](healthkit/hkvisionprism/horizontalamount.md)
- [verticalAmount](healthkit/hkvisionprism/verticalamount.md)
- [verticalBase](healthkit/hkvisionprism/verticalbase.md)
- [HKPrismBase](healthkit/hkprismbase.md)