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# kVTCompressionPropertyKey_HeroEye

A value that indicates which eye is the primary eye when rendering in 2D.

```
let kVTCompressionPropertyKey_HeroEye: CFString
```

## Discussion

This property sets a value for the <doc://com.apple.documentation/documentation/CoreMedia/kCMFormatDescriptionExtension_HeroEye> format description on the output samples. Supported values are <doc://com.apple.documentation/documentation/CoreMedia/kCMFormatDescriptionHeroEye_Left> or <doc://com.apple.documentation/documentation/CoreMedia/kCMFormatDescriptionHeroEye_Right>.

## Topics

### Hero Eye Values

[`kVTHeroEye_Left`](/documentation/VideoToolbox/kVTHeroEye_Left)

[`kVTHeroEye_Right`](/documentation/VideoToolbox/kVTHeroEye_Right)


---

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