If you close your eyes and push on your eyeballs, you see colours and oscillating patterns. Why is this?

Question: If you close your eyes and push on your eyeballs, you see colours and oscillating patterns. Why is this?
- Keywords:
  body,
  eye,
  eye, body
Asked by nicenadia to Alessandro, Angela, Claudia, Marina, Phil on 12 Mar 2013.
- Marina De Vos answered on 12 Mar 2013:
  
  You will be pressing on sensitive nerves which are used to send images to the brain. The colours and patters are their response to the pressure.

Question: If you close your eyes and push on your eyeballs, you see colours and oscillating patterns. Why is this?