Local birefringence of the anterior segment of the human eye in a single capture with a full range polarisation-sensitive optical coherence tomography

2017 ◽  
Author(s):  
Qingyun Li ◽  
Karol Karnowski ◽  
Martin Villiger ◽  
David D. Sampson
Keyword(s):  
Optical Coherence Tomography ◽  
Full Range ◽  
Anterior Segment ◽  
Optical Coherence ◽  
Human Eye ◽  
Single Capture

scholarly journals Five-Frame Variable Phase-Shifting Method for Full-Range Spectral-Domain Optical Coherence Tomography

2018 ◽  
Vol 8 (9) ◽  
pp. 1580
Author(s):  
Jiewen Lin ◽  
Shuncong Zhong ◽  
Qiukun Zhang ◽  
Weiqiang Chen
Keyword(s):  
Optical Coherence Tomography ◽  
Full Range ◽  
Anterior Segment ◽  
Phase Shifts ◽  
Phase Shifting ◽  
Spectral Domain ◽  
Complex Conjugate ◽  
Optical Coherence ◽  
Variable Phase ◽  
Sd Oct

In order to achieve a better complex conjugate artifacts (CCA) suppression, we propose a five-frame variable phase-shifting (FVP) method for spectral domain optical coherence tomography (SD-OCT). The traditional five-frame invariant phase-shifting (FIP) method employs five phase shifts correlate with the center wavelength. However, due to the effects of polychromatic errors, the FIP method cannot get excellent CCA suppression. In the present work, we employ FVP method using variable phase shifts which is dependent on all the wavelengths and therefore, theoretically, the system would have no effects of polychromatic errors. This is the reason why the FVP method would achieve better CCA suppression than the FIP method. Comparative studies between FIP and FVP methods are investigated in the work. Subsequently, we develop a homemade SD-OCT system involving a homemade spectrometer, by which the anterior segment of a rat’s eyeball is measured. The experimental results demonstrate that the quality of OCT images is significantly improved by using FVP method with an increase by a factor of 1.7 on the CCA suppression of SD-OCT. FVP provides a new strategy for complex conjugate artifacts suppression for spectral domain optical coherence tomography.

scholarly journals Erratum to: Accommodative changes in human eye observed by Kitasato anterior segment optical coherence tomography

2013 ◽  
Vol 57 (4) ◽  
pp. 416-416
Author(s):  
Nobuyuki Satoh ◽  
Kimiya Shimizu ◽  
Atsushi Goto ◽  
Akihito Igarashi ◽  
Kazutaka Kamiya ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Anterior Segment ◽  
Optical Coherence ◽  
Human Eye

Accommodative changes in human eye observed by Kitasato anterior segment optical coherence tomography

2012 ◽  
Vol 57 (1) ◽  
pp. 113-119 ◽  
Author(s):  
Nobuyuki Satoh ◽  
Kimiya Shimizu ◽  
Atsushi Goto ◽  
Akihito Igarashi ◽  
Kazutaka Kamiya ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Anterior Segment ◽  
Optical Coherence ◽  
Human Eye

Pediatric Free-floating Anterior Chamber Cyst of the Iris Pigment Epithelium

2018 ◽  
Vol 1 ◽  
pp. 3
Author(s):  
Joshua S Agranat ◽  
Yoshihiro Yonekawa
Keyword(s):  
Optical Coherence Tomography ◽  
Anterior Chamber ◽  
Incidental Finding ◽  
Pigment Epithelium ◽  
Anterior Segment ◽  
Ultrasound Biomicroscopy ◽  
Optical Coherence ◽  
Visual Axis ◽  
Associated Malignancy ◽  
Anatomic Locations

Iris pigment epithelial (IPE) cysts are a subset of iris cysts that arise from the IPE. They are spontaneously erupting epithelial-lined cavities that are found in various anatomic locations of the iris, including the iris pupillary margin, midzone, periphery, and free floating in the vitreous or anterior chamber. We report the case of an asymptomatic 13-year-old boy with an incidental finding of a dislodged anterior chamber cyst diagnosed on routine examination. Modern multimodal image analysis of the cyst including anterior segment optical coherence tomography and ultrasound biomicroscopy (UBM) was utilized to characterize the microstructural anatomy of the lesion. The patient was managed conservatively without complications. Cysts of the IPE typically do not affect vision or ocular health and can be monitored and observed after ascertaining no associated malignancy. Initial diagnostic investigation can include UBM and anterior segment optical coherence tomography. Intervention should be reserved only for cases where the cyst growth leads to obstruction of the visual axis and/or other secondary complications.

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