Cognitive Function and Subfoveal Choroidal Thickness: The Beijing Eye Study

Since the landmark study by Spaide et al1 described the enhanced depth imaging mode of spectral-domain optical coherence tomography to visualize the choroid, choroidal thickness has been examined intensively in recent investigations. None of the preceding studies examined whether neurologic diseases were associated with an abnormal choroidal thickness, although the choroidal blood vessels predominantly influencing choroidal thickness can be regarded as an extracranial part of the intracranial cerebral vascular system.