[Genetic aspects of esotropia in homozygous twins]

The present paper reports on 14 pairs of monozygotic twins with ocular motility disorders. Eight pairs were concordant and two partially concordant, while four pairs were discordant. Four pairs were born prematurely; two pairs were born by cesarean section, one of them also prematurely. Of the 24 patients with motility disorders, 10 had congenital squint syndrome, nine microtropia, one accommodative esotropia, two esophoria, and two orbital strabismus due to premature synostosis of the coronal suture. Genetic and exogenic factors and the forms of strabismus are discussed.