Although the outer border of the retinal pigment epithelium (RPE) hyper-reflective band is clear for the measurement of the subfoveal choroidal thickness (SFCT), the sclerochoroidal interface is not always easy to distinguish4. In case of artifact, it is more difficult to determine the accurate choroidal thickness. We found a widespread artifact that easily blurred the sclerochoroidal interface in EDI-OCT in our clinical practice. But the artifact has never been reported before.