Post-concussion syndrome
About 10% of people with PCS develop sensitivity to light or noise, about 5% experience a decreased sense of taste or smell, and about 14% report blurred vision. People may also have double vision or ringing in the ears, also called tinnitus. PCS may cause insomnia, fatigue, or other problems with sleep.
Harry Carson
While Carson has acknowledged he has "managed" the long term effects of concussions he does not know if he has been affected by chronic traumatic encephalopathy (CTE). When asked, Carson is increasingly critical of the NFL and questions whether football should be played, as he believes the hazards of concussions and subconcussive hits are not an understood risk such as physical ailments are. He is quoted in this interview as saying of the NFL's $765 million settlement with former players that "the NFL has given everybody 765 million reasons why you don't want to play football."