Blows To The Head Lead To Vision Loss – Part 2 of 3
Symptoms include headache, blurry vision and difficulty sleeping or thinking clearly. Research on repetitive brain impacts not associated with diagnosed concussions is scanty and contradictory, the researchers said. McAllister, who conducted the research while affiliated with Dartmouth College, compared 80 concussion-free varsity football and ice hockey players wearing specialized helmets to 79 athletes in noncontact sports.
He evaluated them before and after the mellow with brain scans and learning and memory tests. A total of 20 percent of the contact-sport players and 11 percent of the noncontact athletes performed worse on a exam of verbal learning and memory at the end of the season, a decline expected in less than 7 percent of a normal population. Those performing worse exhibited more changes in the corpus callosum precinct of the brain – a bundle of nerves connecting the left and right sides of the brain – than athletes who scored as predicted.
Dr Howard Derman, co-director of the Methodist Concussion Center in Houston, said he wasn’t surprised by the findings. He said blows to the crest without a reported concussion might cause brain damage that doesn’t bring about symptoms.