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Type I: Limited abduction with or without esotropia. Type II: Limited adduction with or without exotropia. Type III: Limitation of both abduction and adduction and any form of horizontal strabismus. Brown (1950) has classified Duane's syndrome according to the characteristics of the limitation of movement-.
Anisometropia is a condition in which a person's eyes have substantially differing refractive power. [1] Generally, a difference in power of one diopter (1D) is the threshold for diagnosis of the condition .