This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
[{'content': 'Posterior polymorphous dystrophy – \nSelect and explain. \nA. Causes corectopia, B. Is inherited in an autosomal recessive fashion, C. Causes blindness in over 90% of sufferers, D. Can be treated with lamellar corneal grafts', 'role': 'user'}, {'content': "Answer: A \nExplanation: Posterior polymorphous dystrophy\n\nIt is a dominantly inherited dystrophy of endothelium and Descemet's membrane\nThe most typical finding is a cluster or linear arrangement of vesicles in the posterior cornea surrounded by a grey haze\nThe deep corneal stroma and Descemet's membrane may also have band- like thickenings, white patches, peau d ' orange appearance or excrescences that project into the anterior chamber.\nThere may be associated corneal edema, iris atrophy, mild corectopia and iridocorneal adhesions.\nMost cases of this syndrome are non- progressive and the individuals affected maintain good vision throughout their lives.\nA minority of patients develop corneal edema and glaucoma.\nMost cases require no treatment. If the cornea becomes edematous, the patient should be treated with hypertonic saline, soft contact lenses and penetrating keratoplasty.\n\nNote :\n\nCorectopia is the displacement of the eye's pupil from its normal central position, i.e., abnormal location of the pupil of the eye.", 'role': 'assistant'}]