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OCT Angiography Artifacts

Artifacts are very common in OCT angiography and their identification is important for appropriate image interpretation ( ). Blockage Artifacts ( Fig. 5.2.1 ) Blockage artifacts are caused by lesions that affect light penetration through ocular tissues, including both the anterior and posterior segments. Anterior segment blockage can be cause by cataract, inflammation, or corneal scar. Posterior segment blockage can be caused by intravitreal hemorrhage or…

OCT: Artifacts and Errors

Summary Artifacts can occur during image acquisition or analysis because of patient, operator, or software factors. Accurate image interpretation depends on the quality of the image and an understanding of the various artifacts that can affect an OCT image ( ). Mirror Artifact Occurs only on spectral domain (SD) OCT. Occurs when the area of interest crosses the zero-delay line and results in an inverted image.…

Normal Optic Nerve

Summary Spectral domain (SD) OCT devices have two scan patterns used to analyze the optic nerve head: volume scans and line scans. Volume Scans Volume scans acquire a volumetric set of data, centered at the optic nerve head. It delineates the optic disc margin and optic disc surface contour and is segmented to obtain the retinal nerve fiber boundaries. Each device has its own scanning protocol.…

Novel Technique, Challenges and Outlook for the Future in Aesthetic Surgery of the Asian Eyelid

Combined Approach of Partial Incision Technique with Medial Tunnel Fixation (Incorporating a Buried Orbicularis–Aponeurosis Suture) An ideal compromise would be to combine an external incision approach across the central 50% of the proposed area for an eyelid crease, combined with buried suture ligation over the medial end by way of the open central wound. This avoids any incision through the thicker medial canthal skin and still…