<prompt> What is the diagnosis in this 31-year-old woman with gradual bilateral vision loss?GlaucomaGraves ophthalmopathyMarfans syndromeRetinitis pigmentosa  <response>: Answer C. Marfans syndromeThe imaging shows posterior dislocation of the lens in both eyes. The most common cause of bilateral ectopia lentis is Marfans syndrome, the diagnosis in this case. 