Thanks for posting your query.
You should immediately consult with general surgeon/ neurosurgeon and should go for thorough check up.
Have you undergone CT scan
of head previously at the time of injury?
Severe injury at back of head may cause fracture
in bone with exposure of brain but this a very serious condition and it should not be taken lightly.
Although possibility appears to be low.
Loss of vision with touching nay also cause seizure
activity in brain.
You should go for CT/ MRI
scan of head for better clarification.
Dr. Mayank Bhargava