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Lamina Cribrosa

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https://www.readbyqxmd.com/read/28715592/inter-relationship-of-arterial-supply-to-human-retina-choroid-and-optic-nerve-head-using-micro-perfusion-and-labeling
#1
Paula K Yu, Ian L McAllister, William H Morgan, Stephen J Cringle, Dao-Yi Yu
Purpose: The prevailing view is that the human retina is supplied by the central retinal artery (CRA), the short posterior ciliary arteries (SPCAs) support the choroid, and both the CRA and the SPCAs are so-called "end artery" systems. In this study, we investigate whether vascular connections among the retina, choroid, and the optic nerve head (ONH) exist, using selective cannulation and microperfusion-labeling techniques. Methods: The CRA and/or one or more of the SPCAs were selected for cannulation in 18 human donor eyes...
July 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28687851/microstructural-crimp-of-the-lamina-cribrosa-and-peripapillary-sclera-collagen-fibers
#2
Ning-Jiun Jan, Celeste Gomez, Saundria Moed, Andrew P Voorhees, Joel S Schuman, Richard A Bilonick, Ian A Sigal
Purpose: Although collagen microstructural crimp is a major determinant of ocular biomechanics, no direct measurements of optic nerve head (ONH) crimp have been reported. Our goal was to characterize the crimp period of the lamina cribrosa (LC) and peripapillary sclera (PPS) at low and normal IOPs. Methods: ONHs from 11 sheep eyes were fixed at 10-, 5-, or 0-mm Hg IOP and crimp periods measured manually from coronal cryosections imaged with polarized light microscopy (PLM)...
July 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28687850/author-response-biomechanical-responses-of-lamina-cribrosa-to-intraocular-pressure-change-assessed-by-optical-coherence-tomography-in-glaucoma-eyes
#3
Harry A Quigley
No abstract text is available yet for this article.
July 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28687849/biomechanical-responses-of-lamina-cribrosa-to-intraocular-pressure-change-assessed-by-optical-coherence-tomography-in-glaucoma-eyes
#4
Gema Rebolleda, Laura Díez-Álvarez, Victoria de Juan, Francisco J Muñoz-Negrete
No abstract text is available yet for this article.
July 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28666629/ageing-and-ocular-tissue-stiffness-in-glaucoma
#5
REVIEW
Baiyun Liu, Sara McNally, Jason I Kilpatrick, Suzanne P Jarvis, Colm J O'Brien
Glaucoma is a progressive and chronic neurodegenerative disorder characterised by damage to the inner layers of the retina and deformation of the optic nerve head. The degeneration of retinal ganglion cells (RGCs) and their axons results in an irreversible loss of vision and is correlated with increasing age. Extracellular matrix (ECM) changes related to natural ageing generates a stiffer extracellular environment throughout the body. Altered age-associated ocular tissue stiffening plays a major role in a significant number of ophthalmic pathologies...
June 27, 2017: Survey of Ophthalmology
https://www.readbyqxmd.com/read/28615925/anterior-lamina-cribrosa-surface-depth-in-healthy-saudi-females
#6
Amira El-Agamy, Fayrouz Oteaf, Mohamed Berika
PURPOSE: This study was conducted to determine normative profile of anterior lamina cribrosa surface depth (ALCSD) in healthy Saudi females using Topcon Three-Dimensional (3D) Optical Coherence Tomography (OCT) 2000 - Spectral Domain (SD-OCT). In addition, the correlation between ALCSD and other clinical factors such as age, refractive error, intraocular pressure (IOP), central corneal thickness, anterior chamber depth, axial length, retinal nerve fiber layer thickness, and disk area was also assessed...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28615670/optic-disc-hemorrhage-and-lamina-cribrosa-defects-in-glaucoma-progression
#7
Hae-Young Lopilly Park, Jiyoung Lee, Younhea Jung, Chan Kee Park
Both disc hemorrhages (DH) and focal lamina cribrosa (LC) defects are recently considered as a progression factor in glaucoma. However, the clinical relevance of the presence of LC findings at the site of the DH has not yet been determined. We conducted a prospective study enrolling a total of 98 glaucoma eyes with DH and 37 OAG eyes with focal LC defect without DH to determine whether visual field (VF) progression differs according to the findings of the LC that had been evaluated by enhanced depth imaging (EDI) of optical coherence tomography (OCT) and its relationship with DH...
June 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28551164/multiple-temporal-lamina-cribrosa-defects-in-myopic-eyes-with-glaucoma-and-their-association-with-visual-field-defects
#8
Yu Sawada, Makoto Araie, Makoto Ishikawa, Takeshi Yoshitomi
PURPOSE: To investigate characteristics of lamina cribrosa (LC) defects in myopic eyes with open-angle glaucoma (OAG) using spectral-domain (SD) optical coherence tomography (OCT). DESIGN: Cross-sectional study. PARTICIPANTS: One hundred thirty-three eyes with OAG and 83 eyes without OAG, with axial length of 24 mm or more. METHODS: Serial enhanced depth imaging SD OCT B-scans of the optic disc were acquired and reviewed for LC defects (diameter, ≥100 μm) and large pores (diameter, 60-100 μm)...
May 24, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28528864/effects-of-collagen-microstructure-and-material-properties-on-the-deformation-of-the-neural-tissues-of-the-lamina-cribrosa
#9
A P Voorhees, N-J Jan, I A Sigal
It is widely considered that intraocular pressure (IOP)-induced deformation within the neural tissue pores of the lamina cribrosa (LC) contributes to neurodegeneration and glaucoma. Our goal was to study how the LC microstructure and mechanical properties determine the mechanical insult to the neural tissues within the pores of the LC. Polarized light microscopy was used to measure the collagen density and orientation in histology sections of three sheep optic nerve heads (ONH) at both mesoscale (4.4μm) and microscale (0...
May 18, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28494490/biomechanical-responses-of-lamina-cribrosa-to-intraocular-pressure-change-assessed-by-optical-coherence-tomography-in-glaucoma-eyes
#10
Harry Quigley, Karun Arora, Sana Idrees, Francisco Solano, Sahar Bedrood, Christopher Lee, Joan Jefferys, Thao Nguyen
Purpose: The purpose of this study was to measure change in anterior lamina cribrosa depth (ALD) globally and regionally in glaucoma eyes at different intraocular pressures (IOP). Methods: Twenty-seven glaucoma patients were imaged before and after IOP-lowering procedures using optical coherence tomography. The anterior lamina was marked in approximately 25 locations in each of six radial scans to obtain global and regional estimates of ALD. ALD and its change with IOP were compared with optic disc damage, nerve fiber layer thickness, and visual field loss...
May 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28486274/a-novel-method-for-assessing-lamina-cribrosa-structure-ex-vivo-using-anterior-segment-enhanced-depth-imaging-optical-coherence-tomography
#11
Jason L Chien, Mark P Ghassibi, Pooja Mahadeshwar, Pengcheng Li, Jeffrey M Liebmann, Robert Ritch, Tatyana Milman, Sung Chul Park
PURPOSE: The purpose of this study is to investigate the use of anterior segment enhanced depth imaging (EDI) optical coherence tomography (OCT) for ex vivo lamina cribrosa (LC) imaging. MATERIALS AND METHODS: After removing anterior segment and vitreous, the optic nerve head (ONH) tissue of porcine eyes was placed on a customized eye holder for imaging. Serial EDI OCT B-scans (interval, ∼35 μm) of the ONH were obtained using anterior segment module of spectral-domain OCT...
July 2017: Journal of Glaucoma
https://www.readbyqxmd.com/read/28461018/serial-changes-in-lamina-cribrosa-depth-and-neuroretinal-parameters-in-glaucoma-impact-of-choroidal-thickness
#12
Jayme R Vianna, Victoria R Lanoe, Jack Quach, Glen P Sharpe, Donna M Hutchison, Anne C Belliveau, Lesya M Shuba, Marcelo T Nicolela, Balwantray C Chauhan
PURPOSE: To determine whether: (1) change in lamina cribrosa depth occurs more frequently than change in neuroretinal parameters in glaucoma, and (2) Bruch's membrane or anterior sclera should be used as a reference plane when measuring laminar depth. DESIGN: Prospective observational study. PARTICIPANTS: One hundred fifty-five glaucoma patients and 35 healthy controls. METHODS: Anterior laminar depth from a Bruch's membrane (LD-BM) or anterior sclera (LD-AS) reference plane were measured with optical coherence tomography...
April 28, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28446148/circumpapillary-retinal-nerve-fiber-layer-thickness-anterior-lamina-cribrosa-depth-and-lamina-cribrosa-thickness-in-neovascular-glaucoma-secondary-to-proliferative-diabetic-retinopathy-a-cross-sectional-study
#13
Satoshi Yokota, Yuji Takihara, Yoshihiro Takamura, Masaru Inatani
BACKGROUND: To compare the lamina cribrosa between eyes with and without neovascular glaucoma (NVG) using enhanced depth imaging spectral-domain optical coherence tomography. METHODS: Forty-six patients with proliferative diabetic retinopathy were enrolled in this cross-sectional study. The patients were divided into two groups based on the absence or presence of NVG (the non-NVG group and the NVG group, respectively). The intraocular pressure (IOP), circumpapillary retinal nerve fiber layer (cpRNFL) thickness, anterior lamina cribrosa depth (ALD), and laminar thickness (LT) were compared between the groups...
April 26, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28430332/relationship-between-corneal-biomechanical-properties-and-optic-nerve-head-changes-after-deep-sclerectomy
#14
Laura Díez-Álvarez, Francisco J Muñoz-Negrete, Pilar Casas-Llera, Noelia Oblanca, Victoria de Juan, Gema Rebolleda
PURPOSE: To evaluate corneal biomechanical properties and optic nerve head (ONH) changes following deep sclerectomy (DS) and the relation to each other. METHODS: Forty-nine eyes with primary open-angle glaucoma that underwent DS were studied. Corneal biomechanical properties were assessed using the Ocular Response Analyzer and the ONH was evaluated by Spectralis optical coherence tomography with enhanced depth imaging technology before surgery and 3 months postoperatively...
April 4, 2017: European Journal of Ophthalmology
https://www.readbyqxmd.com/read/28391369/relationship-between-lamina-cribrosa-displacement-and-trans-laminar-pressure-difference-in-papilledema
#15
Javier García-Montesinos, Francisco J Muñoz-Negrete, Victoria de Juan, Gema Rebolleda
PURPOSE: The purpose of this study was to describe morphological changes in lamina cribrosa (LC), prelaminar tissue thickness (PTT) and Bruch's membrane opening (BMO) in eyes affected by papilledema and correlate them with trans-LC-pressure difference (TLCD). METHODS: This was a prospective study, including twelve eyes newly diagnosed of papilledema. Eyes underwent scanning with Spectralis-OCT with enhanced depth imaging to compare BMO, anterior LC surface position (LC depth-LCD-) and PTT before and after oedema resolution...
April 8, 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/28389675/deformation-of-the-lamina-cribrosa-and-optic-nerve-due-to-changes-in-cerebrospinal-fluid-pressure
#16
Andrew J Feola, Baptiste Coudrillier, John Mulvihill, Diogo M Geraldes, Nghia T Vo, Julie Albon, Richard L Abel, Brian C Samuels, C Ross Ethier
Purpose: Cerebrospinal fluid pressure (CSFp) changes are involved or implicated in various ocular conditions including glaucoma, idiopathic intracranial hypertension, and visual impairment and intracranial pressure syndrome. However, little is known about the effects of CSFp on lamina cribrosa and retrolaminar neural tissue (RLNT) biomechanics, potentially important in these conditions. Our goal was to use an experimental approach to visualize and quantify the deformation of these tissues as CSFp increased...
April 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28383403/influence-of-the-lamina-cribrosa-on-the-rate-of-global-and-localized-retinal-nerve-fiber-layer-thinning-in-open-angle-glaucoma
#17
Hae-Young Lopilly Park, Sung In Kim, Chan Kee Park
The advent of optical coherence tomography (OCT) imaging allows identification of the structural contribution of the lamina cribrosa (LC) to glaucoma progression. This study aimed to determine the role of various LC features, such as the LC depth (LCD), LC thickness (LCT), and focal LC defects, on the future rate of progressive retinal nerve fiber layer (RNFL) thinning in patients with glaucoma. One hundred eighteen patients with glaucoma who had undergone at least 4 OCT examinations were included. Features of LC, including the LCD, LCT, and presence of focal LC defects, from serial scan of the optic disc using the enhanced depth imaging of Spectralis OCT; were analyzed at baseline...
April 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28353690/impact-of-rates-of-change-of-lamina-cribrosa-and-optic-nerve-head-surface-depths-on-visual-field-progression-in-glaucoma
#18
Zhongheng Wu, Chen Lin, Michael Crowther, Heather Mak, Marco Yu, Christopher K-S Leung
Purpose: To investigate the impact of the rates of change of anterior lamina cribrosa surface depth (ALCSD) and optic nerve head surface depth (ONHSD) on visual field (VF) progression in glaucoma. Methods: One hundred forty-six eyes of 95 glaucoma patients had optical coherence tomography ONH imaging and VF testing at approximately 4-month intervals for greater than or equal to 5 years. Anterior lamina cribrosa surface depth and ONHSD were measured with reference to (1) Bruch's membrane opening (BMO), and (2) choroid-sclera interface (CSI)...
March 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28324116/thick-prelaminar-tissue-decreases-lamina-cribrosa-visibility
#19
Katie A Lucy, Bo Wang, Joel S Schuman, Richard A Bilonick, Yun Ling, Larry Kagemann, Ian A Sigal, Ireneusz Grulkowski, Jonathan J Liu, James G Fujimoto, Hiroshi Ishikawa, Gadi Wollstein
Purpose: Evaluation of the effect of prelaminar tissue thickness on visualization of the lamina cribrosa (LC) using optical coherence tomography (OCT). Methods: The optic nerve head (ONH) region was scanned using OCT. The quality of visible LC microstructure was assessed subjectively using a grading system and objectively by analyzing the signal intensity of each scan's superpixel components. Manual delineations were made separately and in 3-dimensions quantifying prelaminar tissue thickness, analyzable regions of LC microstructure, and regions with a visible anterior LC (ALC) boundary...
March 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28323178/study-on-the-deformations-of-the-lamina-cribrosa-during-glaucoma
#20
Hanjing Tian, Long Li, Fan Song
The lamina cribrosa is the primary site of optic nerve injury during glaucoma, and its deformations induced by elevated intraocular pressure are associated directly with the optic nerve injury and visual field defect. However, the deformations in a living body have been poorly understood yet so far. It is because that integral observation and precise measurement of the deformations in vivo are now almost impossible in the clinical diagnosis and treatment of glaucoma. In the present study, a new mechanical model of the lamina cribrosa is presented by using Reissner's thin plate theory...
March 18, 2017: Acta Biomaterialia
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