Hold your hands in front of you as if you were framing a picture. Now focus on an object in that frame. Keep your hands in that position, and close one eye. Open that eye, and close the other. Which eye kept that object in the frame?
The eye that kept the object in the frame is your dominant eye.
Why is this important to know? Because it will help you sink more putts.
Hah! you say..."only a new putter can do that for me."...I'm sorry to say, you don't need to buy that shiny new putter in the window.
Next time you're on the practice putting green, stick a tee in the ground...this will be your "hole"...now, line up a few balls three feet or so behind the hole.
Standing over the ball, focus on making the putt with your dominant eye open, and the other closed. Practice with this technique for a while.
Keep both eyes open when you tee it up on the course, but take this mental thought of how to use your dominant eye when you play.
Keep it in the short grass!