Figure 4
From: Lacrimal Canaliculus Imaging Using Optical Coherence Tomography Dacryography
Contrast-enhanced optical coherence tomography dacryography (OCTD) images of the lower lacrimal passage in a healthy individual. (A) Longitudinal OCTD image of the lacrimal canaliculus (LC) before contrast agent (rebamipide ocular suspension) instillation. The LC lumen appears as a low-intensity area surrounded by eyelid tissues exhibiting a higher intensity. The LC opening at the punctum is visible. Scale bar = 500 µm. (B) Longitudinal OCTD image of LC after ocular contrast agent instillation. The LC lumen appears as a high-intensity area that is easily differentiated from the LC epithelium (narrow bands) between the orbicularis oculi muscle and the LC lumen. Scale bar = 500 µm. (C,D,E) Images of the horizontal LC lumen recorded at 1-mm intervals (arrows) from the proximal horizontal LC indicated in (B). LC exhibits a flat lumen, and the transverse length is greater than the anteroposterior length. Scale bar = 200 μm.
