S3·E16 Out of Sight

Two men grab Dan out of his place and take him to the desert where they try to kill him but Dan tries to get away but is shot. When Dan is found and taken to the hospital. When he wakes up, he discovers he's blind. Dan thinks that the case he was currently working on, wherein an oilman suspects another oilman whom he is competition for some oil leases, is mobbed up, is why someone tried to kill him, because it looks like a mob hit. And later one of the doctors at the hospital tells Dan than his blindness was not caused by the gun shot. The doctor thinks it could be psychological which Dan doesn't believe.