IMPROVED VISUALIZATION OF HENLE FIBER LAYER BY CHANGING THE MEASUREMENT BEAM ANGLE ON OPTICAL COHERENCE TOMOGRAPHYOtani, Tomohiro MD; Yamaguchi, Yumiko MD; Kishi, Shoji MDRetina: March 2011 - Volume 31 - Issue 3 - p 497-501 doi: 10.1097/IAE.0b013e3181ed8dae Original Study Buy Abstract In Brief Author InformationAuthors Article MetricsMetrics Purpose: The outer plexiform layer (OPL) includes the photoreceptor synapse layer and Henle fiber layer (HFL) in the macular area. We attempted to improve optical coherence tomography imaging of the HFL by changing the angle of the measurement beam. Methods: Thirteen normal eyes underwent spectral domain optical coherence tomography. To focus the angle of the measurement beam perpendicular to the obliquely oriented HFL, the beam in the optical coherence tomography system was aimed at the periphery of the pupil. Results: The cross-sectional image of the macular area was inclined right or left if the beam entered from the periphery of the pupil. The reflectivity of the OPL increased because of strong backscattering of light in the half of the macula that was tilted down in cross-sectional images. On the opposite side, the reflectivity of HFL (the outer two-thirds of the OPL) decreased compared with that of the outer nuclear layer, but the photoreceptor synapse layer (the inner one-third of the OPL) remained highly reflective. The mean thicknesses of the OPL that could be visualized 1.0 mm and 1.5 mm from the central fovea were 73.7 ± 7.0 μm and 64.1 ± 8.2 μm, respectively. Conclusion: Positioning the measurement beam perpendicular to HFL enhanced visualization performance. Positioning the measurement beam perpendicular to Henle's fiber layer enhanced visualization performance on optical coherence tomography. From the Department of Ophthalmology, Gunma University School of Medicine, Maebashi, Gunma, Japan. The authors have no proprietary interest in any aspect of this study. Reprint requests: Tomohiro Otani, MD, Department of Ophthalmology, Gunma University School of Medicine, 3 Showamachi, Maebashi, Gunma 371-8511, Japan; e-mail: email@example.com © The Ophthalmic Communications Society, Inc.