Yeah..hmmm...I'm certainly not a medical student. However, my daughter recently visited an eye doc and started vision therapy. He described this process as follows:

Some cells die when you are injured and create a "toxic waste dump" where other cells fear to tread. You end up with gaps, like gaps between malfunctioning spark plugs. Therapies and time will allow the working transmitters to find new ways around the toxic waste dumps. Until then you experience deficits in certain brain functions.