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In page Congenital fibrosis of the extraocular muscles:

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Congenital fibrosis of the extraocular muscles is a class of rare genetic disorders affecting one or more of the muscles that move the eyeballs. Individuals with congenital fibrosis of the extraocular muscles (CFEOM) have varying degrees of ophthalmoplegia (an inability to move the eyes in one or more directions) and ptosis. The condition is present from birth, non-progressive, runs in families, and usually affects both eyes similarly. In the most common form, the superior recti are dysfunctional and the inferior recti, lacking proper opposition, pull the eyes down, forcing the head to be tilted upward in order to see straight ahead.[citation needed]