RESUMO
BACKGROUND: Monozygotic (MZ) or "identical" twins arise from a single fertilized egg, which divides into two embryos at an early stage of development. As a result, MZ twins have identical genomes and are always of the same sex. METHODS: A case of optic nerve hypoplasia and anisometropia, in association with mirror-image presentation in a set of 12-year-old identical twins, is reported. The monozygotic twinning event responsible for identical twins--as well as the rare phenomenon of mirror imaging--is described. RESULTS: The combined occurrence of anisometropia and optic nerve hypoplasia in mirror-image presentation in a set of monozygotic twins provides a unique opportunity to study the genetic versus environmental influences on the development of optic nerve hypoplasia. CONCLUSIONS: Although the cause of optic nerve hypoplasia remains unclear, its associated mirror-image presentation in this case suggests a possible genetic predisposition.
Assuntos
Anisometropia/genética , Doenças em Gêmeos , Doenças do Nervo Óptico/genética , Nervo Óptico/anormalidades , Gêmeos Monozigóticos , Anisometropia/diagnóstico , Criança , Potenciais Evocados Visuais , Feminino , Humanos , Nervo Óptico/patologia , Doenças do Nervo Óptico/diagnóstico , Acuidade Visual , Percepção VisualRESUMO
Residency programs are very new to the optometric profession. In order for optometry to continue its growth, Residency programs must attain its appropriate role in the development of the profession. A committee has been established to support the concept of specialized residency programs in many aspects of optometric care. Initial goals and objections of the committee as well as future endeavors are discussed.
