In the surgery, the last patient to be seen was the good-natured old man, the one who had spoken so kindly about the poor man who had suddenly turned blind. He was there just to arrange a date for an operation on a cataract that had appeared in his one remaining eye, the black patch was covering a void, and had nothing to do with the matter in hand, These are ailments that come with old age, the doctor had said some time ago, when it matures we shall remove it, then you won't recognise the place you've been living in. When the old man with the black eyepatch left and the nurse said there were no more patients in the waiting-room, the doctor took out the file of the man who had turned up blind, he read it once, twice, reflected for several minutes and finally rang a colleague with whom he held the following conversation: I must tell you, today I dealt with the strangest case, a man who totally lost his sight from one instant to the next, the examination revealed no perceptible lesion or signs of any malformation from birth, he says he sees everything white, a kind of thick, milky whiteness that clings to his eyes, I'm trying to explain as best I can how he described it, yes, of course it's subjective, no, the man is relatively young, thirty-eight years old, have you ever heard of such a case, or read about it, or heard it mentioned, I thought as much, for the moment I cannot think of any solution, to gain time I've recommended some tests, yes, we could examine him together one of these days, after dinner I shall check some books, take another look at the bibliography, perhaps I'll find some clue, yes, I'm familiar with agnosia, it could be psychic blindness, but then it would be the first case with these characteristics, because there is no doubt that the man is really blind, and as we know, agnosia is the inability to recognise familiar objects, because it also occurred to me that this might be a case of amaurosis, but remember what I started to tell you, this blindness is white, precisely the opposite of amaurosis which is total darkness unless there is some form of white amaurosis, a white darkness, as it were, yes, I know, something unheard of, agreed, I'll call him tomorrow, explain that we should like to examine him together. Having ended his conversation, the doctor leaned back in his chair, remained there for a few minutes, then rose to his feet, removed his white coat with slow, weary movements. He went to the bathroom to wash his hands, but this time he did not ask the mirror, metaphysically, What can this be, he had recovered his scientific outlook, the fact that agnosia and amaurosis are identified and defined with great precision in books and in practice, did not preclude the appearance of variations, mutations, if the word is appropriate, and that day seemed to have arrived. There are a thousand reasons why the brain should close up, just this, and nothing else, like a late visitor arriving to find his own door shut. The ophthalmologist was a man with a taste for literature and a flair for coming up with the right quotation.