Eye injuries: Corneal abrasion or Scratched cornea.

Eye injury is If you scratch the eye,  the medical term for this is known as "corneal abrasion" You can develop a corneal abrasion from being poked in the eye, or from rubbing the eye  When you have a corneal abrasion, it can cause significant discomfort as well as redness of the eye, and you may also find that you are more sensitive to light.

Medical treatment as soon as possible - either by seeing your family doctor (or going to your nearest walk-in clinic if your family doctor is not available) or optometrist. 

In the case that scratch is superficial in nature, it's often a matter of letting the eye heal on its own though you may find slight relief from numbing drops or the use of artificial teardrops. When you have a corneal abrasion, it's not typically recommended that you cover it with a patch, as this can be a thriving environment for bacteria to grow. 

If a foreign object does enter your eye, it's important that you do not attempt to remove it yourself. Instead, you should present to your local emergency room so that a trained professional can help remove it.