Write the next sentence in the following story.

How to improve your vision naturally
Find a pencil, and mark it somewhere in the middle.
Draw a letter, number or dot on the side of the pencil. For this exercise, you'll focus on the pencil and the dot as you move it toward and away from your eyes.
Pencil push-ups are reputed to correct double vision and crossed eyes, but it can't hurt to try them for other issues-it's free, painless, and only involves focusing and refocusing your eyes. Hold the pencil in front of your face, at arm's length.