He is blind.
Tiresias is blind. (He also had a sex change.)
The Dude was Blind
George Handel went Blind. This affliction also hit Bach. Two musicians who went blind.
deafness
Silas Marner suffers from catalepsy, which causes him to have "trances" or fits where he becomes completely still and unresponsive. This condition leads to his estrangement from his community and further isolation.
science
a Speech (pronunciation) problem
He is blind.
Disable or disability, depending on whether you mean the verb handicap or the noun handicap. defect, impairment, physical abnormality, disadvantage, restriction, obstacle, limitation, drawback, impediment, stumbling block
The physical symptom exhibited by those who suffer from blepharospasms is uncontrollable blinking.
Tiresias. has written: 'Notes from the overground.'
YOU don't calculate it. The Workman's Compensation Board Examiner does.