Can Heavy Intake Of Alcohol Cause Brown Line Going The Through Eyes?

my friend s boyfriend has a brown line going right through his eyes. how long has it been there? unknown! he is 5 8, 175 lbs., he is a 20 hrs. drinker@ every day. he been heavy drinking most of his life and he is only 30 yrs. old. can his heavy drinking be a cause of the brown line in his eyes and is there a disease {s} common with a life-time of drinking?