Often, during the day, our eyes become unfocused and our vision blurs. This can happen when we're "checked out" or when our eyes are tired from staring at a computer screen all day long. We may also keep our vision soft in order to avoid invading the personal space of others.
In yoga, however, we learn to focus our eyes with precision. Instead of allowing the eyes to be soft, we direct our gaze purposefully. Our gaze (called drishti in Sanskrit) can help us direct the energy of a pose, helping us stay mentally clear. The gaze also has other benefits. In twists, using your gaze can help you turn further. In balances, setting your gaze can keep you upright.
The next time you're in class, notice how you use your eyes. Are you sharp and precise in your focus, or do your eyes seem to wander? See if focusing your eyes more carefully can also focus your mind.