I see different color blurry lines on my desktop

Hello meenakshifromcary, 

Welcome to the Apple Support Communities. 

The following troubleshooting steps may help if you are noticing unexpected blurry lines or other issues with your MacBook Pro display. 

1. Restart your Mac. 
2. Update your Mac. 
3. If you are using an external display, reset the connections and restart the display before trying to connect again. This resource will help, if needed with reconnecting, Connect a display to your Mac - Apple Support
4. Test the issue when your Mac is started in safe mode. 
5. Change your display settings to test if using a different resolution or refresh rate resolves the issue. 

You can also find helpful information in the following Apple Support article: If your Mac display doesn’t look right. If this graphical issue only appears when you are using certain applications, use this next article to troubleshoot If an app freezes or quits unexpectedly on Mac - Apple Support

If you are unable to find a solution using the suggestions above, you can contact Apple Support for more help. 

All the best! 

Take a screen shot & view that in Preview, move the Preview window around, if you see double lines it's a Video card/VRAM problem, if the lines do not move moving the pic around then it's the LCD or cable.