When one looks forward at a glass of wine, one is seeing it via the reflection of light off of the glass. But if you have a person to your right, looking to the left side of you (still in front of your face), he can see objects across the room that are not in your peripheral vision. Considering that the light which is reflecting off of the object to your left is passing directly in front of you to your friend to the left, why are we unable to see that reflection?
In other words, why can we only see the light reflections of objects in front of us, but not the light reflections of objects which pass our eyes from our left or right?