Fifteen patients with diplopia associated with prior scleral buckling, prior penetrating keratoplasty, severe corneal scarring, monocular aphakia, long-standing strabismus, or prior vertical offsets of the horizontal recti were thought to have disruption of fusion because diplopia could not be eliminated with prisms. They were each found to have a substantial symptomatic cyclotropia unassociated with an obvious dysfunction of an oblique muscle. In 13 patients, diplopia resolved after the cyclotropia was corrected surgically.