In addition to the great advice posted above, try this drill:

This ensures your eye is looking straight down the target line:

With your putter in hand, set up to a ball, with another ball in your pocket. When you are ready to make your stroke, take your right hand off the putter grip. Take the golf ball from your pocket and hold the ball up to your left eye. Now, drop the ball - it should fall directly on top of the ball your putter is lined up to. If it doesn't fall on top of the ball, adjust your setup until you can. It's amazing how many more putts you will make if you are looking directly down the target line!

__________________
Gord

Quote of the month:
"It's easy to see golf not as a game at all but as some whey-faced, nineteenth-century Presbyterian minister's fever dream of exorcism achieved through ritual and self-mortification." ~Bruce McCall