Keeping the trunk, neck and head erect and still, looking at the tip of the nose between the eye-brows, and not looking here and there at any direction at all –
Krishna outlines how the body should be held to ensure a successful, absorptional meditation. Unless these details are clearly understood and heeded, the attempt at meditation may not be effective. The subtler the ways, the better will be the delving within.
Sit cross-legged. Keep the fingers interlocked and put them on the lap. To prevent the eyes from looking at the surroundings, keep the body, neck and head erect, so that you will not droop. Be looking at the tip of the nose, between the eye-brows. Let them not deflect from there. Krishna as a further safeguard adds that the practitioner should not look outside in any direction.
This method dexterously ensures that though the eyes are open, they cannot see anything at all. Anywhere any time the eyes will have something to see, unlike the ear and nose. Visual distraction is hard to overcome, and one has to be earnest in this.