To describe the findings of macular coloboma using swept-source optical coherence tomography (SS-OCT)Methods
A 35-year-old man was found to have bilateral deep excavation of the maculae and was diagnosed clinically with bilateral macular coloboma. SS-OCT showed deep excavation of the sclera corresponding to the area of coloboma. There is loss of overlying retinal pigment epithelium (RPE), neurosensory retina and choroid within the area of excavation. A thin membranous structure is seen overlying the area bared sclera. At both edges of the coloboma, intraretinal cystic changes can be seen.Conclusion
The SS-OCT is able to image the posterior border of the deep coloboma in this case. In addition, the detailed structure of the retinal layers can be studied. This membranous structure likely represents the remnants of degenerative neurosensory retina and internal limiting membrane. In addition, we also demonstrated intraretinal cysts, not previously reported, at the edges of the coloboma. The use of SS-OCT technology has enabled the capturing of the retina, RPE and choroid at a much better resolution and this has served to provide greater understanding of the anatomical changes seen in macular coloboma.