Abstract

In monozygotic twins two embryos are formed from a single fertilized egg. In "mirror image twins" identical siblings have reverse asymmetric features in the right and left sides of the body. We report the case of twins with mirror-image hypermetropic anisometropia. They were referred to an ophthalmologist at the age of 3.5years for amblyopia. Cycloplegic refraction of twin 1 was +1.00 in the right eye and +4.50 -0.75 ×180 in the left eye; of twin 2, +4.75 -1.00 ×180 and+1.25. Keratometry and axial length were measured with Lenstar LS 900 when the twins were 6years of age. In twin 1, the axial length was 22.18mm in the right eye and 20.97 in the left eye; in twin 2, 20.94mm and 22.13. Keratomtry of both eyes of these twins was relatively equal.

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