Can severe eyeball laceration be effectively repaired?

Yes but . .: It depends upon the location of the laceration - cornea only, into the sclera - and also whether the laceration damaged the internal components of the eye. It also depends upon whether the laceration was "clean" or accompanied by contusion to the eye and/or the introduction of debris and possible infection. Repair must be immediate, and follow up diligent.

Sometimes: Possibility of repair depends on security of the injury. Some lacerations are easily repaired while others result in loss of the eye. You should see your eye doctor.