---
title: VNDetectHorizonRequestRevision1
framework: vision
role: symbol
role_heading: Global Variable
path: vision/vndetecthorizonrequestrevision1
---

# VNDetectHorizonRequestRevision1

A constant for specifying revision 1 of the horizon detection request.

## Declaration

```swift
var VNDetectHorizonRequestRevision1: Int { get }
```