Vitamin A deficiency and the retinal "double carrot" sign with optical coherence tomography.

Background: Spectral-domain optical coherence tomography (SD-OCT) and full-field electroretinography (ERG) allow retinal assessment with vitamin A deficiency (VAD). Using SD-OCT, this study aimed to characterize and follow a novel retinal abnormality in patients with VAD and intramuscular supplementation.

Methods: Patients with VAD were retrospectively reviewed, including SD-OCT and electroretinography.