Atypical superior iris and retinochoroidal coloboma

Atypical superonasal iris, lens and retino-choroidal coloboma

In this clinical picture, a case of atypical superonasal iris, lens and retino-choroidal coloboma has been described in a 16-year-old boy who complained of defective vision since childhood in the right eye. The right eye showed a coloboma in the supero-nasal region of the iris and lens with fundus showing a superonasal fundal coloboma sparing the disc. No separation of the intercalary membrane was noted. This case adds to a very small number of published cases with superior iris and retinochoroidal colobomas.

Ocular coloboma: Genetic variants reveal a dynamic model of eye development

Ocular coloboma is a congenital disorder of the eye where a gap exists in the inferior retina, lens, iris, or optic nerve tissue. With a prevalence of 2-19 per 100,000 live births, coloboma, and microphthalmia, an associated ocular disorder, represent up to 10% of childhood blindness. It manifests due to the failure of choroid fissure closure during eye development, and it is a part of a spectrum of ocular disorders that include microphthalmia and anophthalmia. Use of genetic approaches from classical pedigree analyses to next generation sequencing has identified more than 40 loci that are associated with the causality of ocular coloboma. As we have expanded studies to include singleton cases, hereditability has been very challenging to prove. As such, researchers over the past 20 years, have unraveled the complex interrelationship amongst these 40 genes using vertebrate model organisms. Such research has greatly increased our understanding of eye development. These genes function to regulate initial specification of the eye field, migration of retinal precursors, patterning of the retina, neural crest cell biology, and activity of head mesoderm. This review will discuss the discovery of loci using patient data, their investigations in animal models, and the recent advances stemming from animal models that shed new light in patient diagnosis.

Repair of Superior Chorioretinal Coloboma-Associated Retinal Detachments: Case Report and Literature Review

Purpose:

This case report discusses the management of a patient with a superior chorioretinal coloboma-associated retinal detachment (RD), including surgical management, along with a review of the literature.

Methods:

A case report is presented.

Results:

A 58-year-old man presented with a chronic RD of the right eye that was symptomatic for approximately 1 year prior to presentation. On examination, he was found to have a macula-off RD associated with superior chorioretinal coloboma. He underwent 23-gauge pars plana vitrectomy with membrane peel, endolaser, and perfluoropropane (14%) gas tamponade. Three months after his surgery, his best-corrected visual acuity in his right eye was 20/250 distance and 20/80 near, and his retina remained attached.

Conclusions:

This case report describes surgical management of a superior chorioretinal coloboma-associated RD.