This patient was watching an air hockey match when the puck flew off the table and hit his eyelid. It lacerated his lid, which will heal rapidly. I dilated the eye to make sure there was no serious injury to the retina and found this area of whitening on the retina corresponding to the location he was hit.
The whitened area of the retina is what we call Commotio Retinae. It is caused by swelling in the retina from trauma. It resolves in about 6 weeks without any consequence to vision or health of the eye.