Shankar Acharya in his commentary makes a good deal of this. He said the point is not to gaze at the tip of your nose because if you did, your mind would be on it. Our attention is immediately pulled out for the moment we open our eyes. We know even modern neuroscience tells us how much of our cognitive capacity is tied up with our visual sense organs.
Swami Sarvapriyananda teaches Chapter 6 (Verses 10-14) of the Bhagavad Gita. In this series of talks, Swami Sarvapriyananda unfolds the highest truths of Vedanta through the study of the Bhagavad Gita (The Song of God).