Eye Placement & Focus

http://www.spiritvoyage.com/blog/index.php/the-power-of-drishti-eye-focus-in-kundalini-yoga/  This is a  great article.  Eye focus is extremely important for meditations and certain yoga postures.  Your focus should never be forced.  The placement of the eyes during meditation helps your mind to focus and calm.  Taken from the article, here are some specific eye focal points and their purpose:

Brow Point -- This gaze stimulates the pituitary gland, strengthening intuition.  It also affects the sushmuna, which is the central column along the spine through which prana flows.  When you consciously move prana through your chakras along the sushmuna, you are building up your aura, also called the 8th chakra by Yogi Bhajan.

Tip of the Nose -- This is Agiaa Chakra Bandh, and in addition to being a drishti, it is a lock within the body.  Locks are kind of like complex damn systems that direct the flow of energy throughout the body in very specific ways.  It stimulates the pineal gland and the frontal lobe of the brain, creating new pathways in the brain.  It can be very challenging for beginners, as there is pressure placed on the optic nerve.

Chin -- This is the moon center gaze, and like the energy of the moon, it brings cooling and calming energy.  It also is very reflective, allowing introspection.

Crown chakra -- Focusing the gaze on the crown chakra, or tenth gate, stimulates it to open.  It also affects the pineal gland.

1/10th open -- Here your eyes are relaxed and unfocused.  This gaze is balancing and calming.  A favorite of the Buddha, it allows your system to remain open to the effects of the particular meditation you are performing.