Strange issue with raycasting from the camera center in Daydream?

I have a control in my game that requires me to see if a ray is going from the "center" of the view into the control and into the object behind it. I've been doing this with this code:

Code (CSharp):

1. //in Start
2. _pointerData = new PointerEventData(EventSystem.current);
3. _pointerData.position = new Vector2(0.5f * Screen.width, 0.5f * _raycastResults = new List<RaycastResult>();
4.  
5. //this function is called from Update:
6. public void CastRaysFromVision()
7.     {
8.         if (EventSystem.current != null)
9.             EventSystem.current.RaycastAll(_pointerData, _raycastResults);
10.  
11.         _overSliderPane = false;
12.         _overSlider = false;
13.         foreach (RaycastResult result in _raycastResults)
14.         {
15.             if (result.gameObject == this.gameObject)
16.             {
17.                 _overSlider = true;
18.             }
19.             else if (result.gameObject == sliderPane)
20.             {
21.                 _overSliderPane = true;
22.                 _positionOnPane = result.worldPosition;
23.             }
24.         }
25.     }

This actually works fine if the viewer is configured to be a Cardboard headset in the Daydream app, or from a normal non-Daydream phone with just the Cardboard app.

However, if I am using the Daydream headset, the raycast seems off, and I have to look slightly above where the object is. It also feels like I am slightly smaller when I have the Daydream headset active. Any ideas on why?

 

The eye texture width was the issue! Thank you.