OCT may help Diagnose and Prognosticate Retinal Degeneration in patients with Wilson's disease

Wilson's disease (WD) is an autosomal recessive disorder caused by mutations in the ATP7B gene, which leads to the deposition of copper in the liver, brain, cornea, and other organs. WD is a treatable disorder, however, if left untreated, it may lead to permanent disability and even death. Hepatic, neurological, and neuropsychiatric variants are the common clinical presentations seen in WD.

The ophthalmic manifestations of WD include the presence of the 'Kayser–Fleischer' (KF) ring in the cornea and the development of a premature cataract, typically described as the "sunflower cataract." While the KF ring results from the abnormal accumulation of copper within the Descemet membrane of cornea, the sunflower cataract is caused by the deposition of copper under the lens capsule. Recently, studies have identified copper deposits and their sequelae in the retina and optic nerve using electroretinography and anterior segment optical coherence tomography (OCT). OCT is a technique used to obtain cross-sectional images of different ocular tissues with high resolution (1–15μm). Using long-wavelength light beams, different layers of ocular tissues can be separated to perform three-dimensional volumetric measurements.

A recent article published in Annals of Indian Academy of Neurology by Bhattacharya et al reviews 16 patients with WD who underwent OCT at their hospital during follow-up visits. They performed Spectral-domain OCT in all subjects to assess the thickness of macula and retinal nerve fiber layer (RNFL) and the data was compared with 14 healthy controls. The thickness was measured at the perifovea for all layers except the outer nuclear layer with the photoreceptor layer (ONL + PRL) which was measured at the center of the fovea. The measurements were made in the macula as a whole and also in the nasal, temporal, superior, and inferior quadrants separately. The thickness of the ganglion cell and inner plexiform layer complex (GCIP), the inner nuclear layer (INL), the outer plexiform layer (OPL), and the ONL + PRL were separately measured.