Trabalho realizado no Wilmer Ophthalmological Institute, Baltimore (MD) USA. 1 Fellow in Cornea and Refractive Surgery at the Wilmer Ophthalmological Institute, The Johns Hopkins University School of Medicine Baltimore (MD) USA. 2 Livre Docente, Professor Adjunto do Departamento de Oftalmologia da Universidade Federal de São Paulo UNIFESP São Paulo (SP) Brasil. 3 Professor at the Wilmer Ophthal...