RGD uses the Human Disease Ontology (DO, https://disease-ontology.org/) for disease curation across species. RGD automatically downloads each new release of the ontology on a monthly basis. Some additional terms which are required for RGD's curation purposes but are not currently covered in the official version of DO have been added. As corresponding terms are added to DO, these custom terms are retired and the DO terms substituted in existing annotations and subsequently used for curation.
A vasculitis that is characterized by inflammation of the vascular branches of the retinal artery and has_symptom painless decrease of visual acuity, visual floaters, dark spot in vision, decreased ability to distinguish colors, and distortion of images such as linear images. (DO)