Yes. It is very much possible. Vision is totally subjective.That means the person see the things is perceived by the subjectonly. So you can bribe and get the blindness certificate. Most ofthe developed world can not imagine this. But the system can becorrupt from top to bottom. Specially in the country like India. Ihave already written about this. Laws in India were made by Britishdesigners. They were made in such a way to facilitate to trap theinnocent Indian and liberate the culprit British citizen. Thesubsequent Indian administrators found it convenient to continuethe laws. In spite of such laws, the British people rarely misusedthe laws. Subsequently the Indian politicians and bureaucratsmisused the laws and developed the system to do large scalecorruption. So as a result the most pious and religious peopleturned out to be the most corrupt. The world has to pay the pricefor this nefarious design of then British designers. It was shortterm gain and long term loss to the world as a whole to have onefifth population corrupt. People call you stupid in India, if youare not corrupt. Then there can be neurotic disorder, in which theperson gets blind. Here the person is not blind. But he is not ableto see also. That means the sensory inputs from the eyes arestrongly suppressed by the brain of the patient.Then there can be malingers, who cheats the doctors. Here therecan be competition between the person and the doctor. Usually it isnot possible to cheat the expert. But it's not impossible.