Imran Khan's sudden loss of vision in one eye is probably another drama to gain public sympathy. We saw how he claimed that he had been hit by seven bullets and needed a wheel chair to get around. But when arrested, he stood up and started walking.
I believe that the next step would be for his doctors to say that he needs treatment in London or New York and should be flown there. That way, everyone will be happy. Imran will claim there was no deal for him to be released. He will be able to spent the next two or three years out of the country and will be able to return when the next general elections are held.
Of course, this kind of thing has happened before, when Nawaz Sharif was allowed by the apex court to go abroad for medical treatment. At that time, when Nawaz was seen walking without assistance, Imran had questioned the chief justice on why he was let go, seeing that he wasn't as sick as portrayed. But then, Nawaz made no secret of the fact that he was going out of the country as part of an agreement. Imran will never admit he made a deal with the powers that be to get out of jail.