What is the moving vertical green bar that keeps moving from side to side on my IPhone 5c?

Hi, ak99gb01.

Thank you for visiting Apple Support Communities.

Here is an article that I would recommend going through for this issue.

Screen

Get help with the screen on your device if it has any of these issues:

• The screen is too dim, too bright, or you see only faint images
• You see a solid color screen (black, white or blue)
• You see lines, missing sections, discoloration, or poor image quality

Get help with other screen issues:

• You have a cracked or shattered screen on your iPhone.
• Your screen doesn't respond to touch.
• Your screen doesn't rotate.
• You notice that some pixels are bright, dark, or it looks like there's debris in the screen.

Get help with hardware features on your iPhone, iPad, and iPod touch

http://support.apple.com/en-us/HT201401

If the issue persists, see the section labeled Issue not solved.

Cheers,

Jason H.