Computed tomography (CT) and magnetic resonance imaging (MRI) are the most common imaging studies ordered by an ophthalmologist to evaluate the orbit, brain, and sometimes the eye. The ophthalmologist also relies on ultrasonography to provide biometrics, facilitate diagnosis, and evaluate the extent of ocular and orbital diseases. This chapter focuses on the basic principles of these imaging modalities, identification of normal anatomical structures, and recognition of the modality that is best suited to evaluate a certain clinical condition. For more specific indications for radiographic studies in particular diseases, consult BCSC volumes covering those entities. See also BCSC Section 5, Neuro-Ophthalmology.
Excerpted from BCSC 2020-2021 series: Section 2 - Fundamentals and Principles of Ophthalmology. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.