title: Iris coloboma in one eye and pigment dispersion syndrome in the fellow eye.
abstract: We report a case of a 43-year-old patient with coloboma of the iris, zonule, ciliary body, choroid and retina in the right eye and pigment dispersion syndrome in the left eye. Considering the hypothesis of the pigment dispersion syndrome pathogenesis in which a difference of pressures in the anterior and posterior chambers creates a posterior convexity of the iris leading to reverse pupillary block, iris touch and consequently causing pigment dispersion, we suggest that the presence of an iris coloboma, by equalising the pressures in the two chambers, prevented the onset of syndrome in that eye.
authors.affiliation: Department of Ophthalmology, Centro Oftalmológico Virgilio Galvis, Universidad Autónoma de Bucaramanga, Floridablanca, Santander, Colombia.
authors.forename: Virgilio
authors.initials: V
authors.lastname: Galvis
authors.forename: Alejandro
authors.initials: A
authors.lastname: Tello
authors.forename: Paul
authors.initials: P
authors.lastname: Valarezo
authors.forename: Angélica M
authors.initials: AM
authors.lastname: Prada
mesh_terms: D000328:Adult; D000867:Anterior Chamber; D002829:Choroid / Q000473:pathology; D002924:Ciliary Body / Q000473:pathology; D003103:Coloboma / Q000150:complications*; D005260:Female; D006801:Humans; D007498:Iris / Q000473:pathology*; D007499:Iris Diseases / Q000150:complications*; D010857:Pigment Epithelium of Eye / Q000473:pathology*; D057972:Posterior Eye Segment; D012160:Retina / Q000473:pathology; D013577:Syndrome