Purple/Green bars appearing randomly on screen

Hello
Earlier today, purple/green bars starting appearing randomly on my imac screen. I managed to grab a screenshot of it.
Sometimes it stops for a long time, and then it reapears for a bit. Is there any way of fixing this?
I am running OS X Mavericks 10.9.2 on a late 2013 imac.
Processor: 2.7 GHz Intel Core i5
Memory: 8 GB 1600 MHz DDR3
Graphics: Intel Iris Pro 1024 MB

There is a one year Apple Hardware Warranty (three year w/AppleCare) on Mac's.
You need to contact your local Apple Store or AASP and make an appointment to have it looked at.
see > Apple - Find Locations

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Purple/Green bars appearing randomly on screen

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