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https://www.readbyqxmd.com/read/28231267/accuracy-of-optical-biometry-combined-with-placido-disc-corneal-topography-for-intraocular-lens-power-calculation
#1
Giacomo Savini, Kenneth J Hoffer, Piero Barboni, Nicole Balducci, Domenico Schiano-Lomoriello, Pietro Ducoli
PURPOSE: To investigate the accuracy of a new optical biometer for intraocular lens (IOL) power calculation in eyes undergoing cataract surgery. METHODS: Consecutive eyes of patients undergoing cataract surgery with the same IOL model were enrolled in a prospective cohort study. Axial length (AL) and corneal power were measured with an optical biometer based on optical low-coherence interferometry and Placido-disc corneal topography. IOL power was calculated with the Hoffer Q, Holladay 1 and SRK/T formulas...
2017: PloS One
https://www.readbyqxmd.com/read/28228834/anti-collapsing-response-mediating-protein-5-antibody-positive-paraneoplastic-perioptic-neuritis-without-typical-neurological-symptoms
#2
Nozomi Igarashi, Hiromasa Sawamura, Toshikatsu Kaburaki, Makoto Aihara
A 68-year-old male presented with blurred vision in both eyes. Ophthalmoscopy revealed bilateral prominent disc swelling and vitritis. No systematic neurological symptoms were observed. Magnetic resonance imaging revealed bilateral meningeal enhancement of the optic nerve. Small cell carcinoma was found, and antibodies against collapsing response-mediating protein-5 (CRMP-5) were detected in the serum. Ophthalmological manifestations disappeared during a decrease in tumour size with treatment for the malignancy...
February 2017: Neuro-ophthalmology
https://www.readbyqxmd.com/read/28228830/optic-disc-and-macular-imaging-in-blind-eyes-from-non-glaucomatous-optic-neuropathy-a-study-with-spectral-domain-optical-coherence-tomography
#3
Linda Hansapinyo, Andy C O Cheng, Noel C Y Chan, Carmen K M Chan
The purpose of this study was to determine and compare the optic disc and macular thickness measurements using two spectral-domain optical coherence tomography (SD-OCT) instruments in long-standing blind eyes diagnosed with non-glaucomatous optic neuropathies (NGON). A prospective observational case-series design was used. Twelve eyes from 12 NGON patients with no light perception for at least 6 months underwent optic disc and macular imaging with Cirrus HD-OCT and Spectralis OCT. The correlation between the peripapillary retinal nerve fibre layer (PRNFL) and macular ganglion cell layer and inner plexiform layer (GCL+IPL) thicknesses, and between the duration of no light perception (NLP) and PRNFL/GCL+IPL thicknesses were determined using Spearman's correlation analysis...
February 2017: Neuro-ophthalmology
https://www.readbyqxmd.com/read/28228436/triamcinolone-emboli-leading-to-central-retinal-artery-occlusion-a-multimodal-imaging-study
#4
Nripen Gaur, Pallavi Singh, Rohan Chawla, Brijesh Takkar
A 19-year-old man presented with unilateral sudden onset vision loss following an intra-articular triamcinolone injection in the right temporomandibular joint. At fundus examination emboli of triamcinolone were visible in multiple retinal arteries. Choroidal ischaemia and occlusion of the central retinal artery and its branches were documented at fluorescein angiography. Optical coherence tomography revealed significant thickening of the inner retinal layers. Optical coherence tomography angiography clearly demonstrated an abrupt cut-off of flow in a vessel below the optic disc...
February 22, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28227213/segmentation-of-optic-disc-and-optic-cup-in-retinal-fundus-images-using-shape-regression
#5
Suman Sedai, Pallab K Roy, Dwarikanath Mahapatra, Rahil Garnavi, Suman Sedai, Pallab K Roy, Dwarikanath Mahapatra, Rahil Garnavi, Suman Sedai, Pallab K Roy, Rahil Garnavi, Dwarikanath Mahapatra
Glaucoma is one of the leading cause of blindness. The manual examination of optic cup and disc is a standard procedure used for detecting glaucoma. This paper presents a fully automatic regression based method which accurately segments optic cup and disc in retinal colour fundus image. First, we roughly segment optic disc using circular hough transform. The approximated optic disc is then used to compute the initial optic disc and cup shapes. We propose a robust and efficient cascaded shape regression method which iteratively learns the final shape of the optic cup and disc from a given initial shape...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227208/mapping-the-retinas-of-a-patient-using-a-mixed-set-of-fundus-photographs-from-both-eyes
#6
Gwenole Quellec, Mathieu Lamard, Guy Cazuguel, Ali Erginay, Beatrice Cochener, Gwenole Quellec, Mathieu Lamard, Guy Cazuguel, Ali Erginay, Beatrice Cochener, Gwenole Quellec, Guy Cazuguel, Mathieu Lamard, Ali Erginay, Beatrice Cochener
With the increased prevalence of retinal pathologies, automating the detection and progression measurement of these pathologies is becoming more and more relevant. Color fundus photography is the leading modality for assessing retinal pathologies. Because eye fundus cameras have a limited field of view, multiple photographs are taken from each retina during an eye fundus examination. However, operators usually don't indicate which photographs are from the left retina and which ones are from the right retina...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226748/integrating-holistic-and-local-deep-features-for-glaucoma-classification
#7
Annan Li, Jun Cheng, Damon Wing Kee Wong, Jiang Liu, Annan Li, Jun Cheng, Damon Wing Kee Wong, Jiang Liu, Jun Cheng, Damon Wing Kee Wong, Jiang Liu, Annan Li
Automated glaucoma detection is an important application of retinal image analysis. Compared with segmentation based approaches, image classification based approaches have a potential of better performance. However, it still remains a challenging problem for two reasons. Firstly, due to insufficient sample size, learning effective features is difficult. Secondly, the shape variations of optic disc introduce misalignment. To address these problem, a new classification based approach for glaucoma detection is proposed, in which deep convolutional networks derived from large-scale generic dataset is used to representing the visual appearance and holistic and local features are combined to mitigate the influence of misalignment...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226741/automated-detection-of-neovascularization-for-proliferative-diabetic-retinopathy-screening
#8
Sohini Roychowdhury, Dara D Koozekanani, Keshab K Parhi, Sohini Roychowdhury, Dara D Koozekanani, Keshab K Parhi, Dara D Koozekanani, Keshab K Parhi, Sohini Roychowdhury
Neovascularization is the primary manifestation of proliferative diabetic retinopathy (PDR) that can lead to acquired blindness. This paper presents a novel method that classifies neovascularizations in the 1-optic disc (OD) diameter region (NVD) and elsewhere (NVE) separately to achieve low false positive rates of neovascularization classification. First, the OD region and blood vessels are extracted. Next, the major blood vessel segments in the 1-OD diameter region are classified for NVD, and minor blood vessel segments elsewhere are classified for NVE...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28221329/relationship-between-anterior-lamina-cribrosa-surface-tilt-and-glaucoma-development-in-myopic-eyes
#9
Eun Jung Lee, Jong Chul Han, Changwon Kee
PURPOSE: To evaluate the anterior lamina cribrosa (LC) surface tilt angle in myopic eyes and associate it with glaucoma development. MATERIALS AND METHODS: In this retrospective study, medical records of myopic patients referred for glaucoma examination from July 1, 2012 to March 30, 2016 were reviewed. Comprehensive ophthalmic examination including spectral-domain optical coherence tomography were performed. We measured the angle of anterior LC surface tilt against Bruch's membrane opening from optical coherence tomography images at the center of the clinical optic disc margin...
February 17, 2017: Journal of Glaucoma
https://www.readbyqxmd.com/read/28220005/double-resonant-enhancement-of-third-harmonic-generation-in-graphene-nanostructures
#10
Jian Wei You, Jie You, Martin Weismann, Nicolae C Panoiu
Intriguing and unusual physical properties of graphene offer remarkable potential for advanced, photonics-related technological applications, particularly in the area of nonlinear optics at the deep-subwavelength scale. In this study, we use a recently developed numerical method to illustrate an efficient mechanism that can lead to orders of magnitude enhancement of the third-harmonic generation in graphene diffraction gratings. In particular, we demonstrate that by taking advantage of the geometry dependence of the resonance wavelength of localized surface-plasmon polaritons of graphene ribbons and discs one can engineer the spectral response of graphene gratings so that strong plasmonic resonances exist at both the fundamental frequency and third-harmonic (TH)...
March 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28218219/reduced-macular-vascular-density-in-myopic-eyes
#11
Hua Fan, Hao-Yu Chen, Hong-Jie Ma, Zheng Chang, Hai-Quan Yin, Danny Siu-Chun Ng, Carol Y Cheung, Shan Hu, Xiang Xiang, Shi-Bo Tang, Shuang-Nong Li
BACKGROUND: Morphological changes of the vasculature system in patients with myopia have been observed by Doppler ultrasound and fundus fluorescein angiography (FFA); however, these studies have limitations. Doppler ultrasound provides low-resolution images which are mainly obtained from visualized large vessels, and FFA is an invasive examination. Optic coherence tomography (OCT) angiography is a noninvasive, high-resolution measurement for vascular density. The purpose of this study was to investigate the change of vascular density in myopic eyes using OCT angiography...
2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28215459/leptomeningeal-metastases-presenting-exclusively-with-ocular-disturbance-in-34-patients-a-tertiary-care-cancer-hospital-experience
#12
Rory Richard Mayer, Benjamin Jay Frankfort, Ben A Strickland, James Matthew Debnam, Ian E McCutcheon, Morris D Groves, Jeffrey S Weinberg
Leptomeningeal disease (LMD) represents disseminated intracranial metastatic disease that requires early detection and initiation of therapy. Patients with LMD typically present with a variety of neurologic problems, including ocular disturbances. However, little is reported on LMD presenting exclusively with ocular-related disturbances in the absence of any other central nervous system (CNS) dysfunction. Our goal was to describe the workup for ocular disturbances in the setting of known cancer diagnosis. Retrospective case study utilizing prospectively collected database at a tertiary cancer care center for all patients with diagnosis of LMD between 2001 and 2009...
February 16, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28211879/evaluation-of-choroidal-tumors-with-optical-coherence-tomography-enhanced-depth-imaging-and-oct-angiography-features
#13
G Cennamo, M R Romano, M A Breve, N Velotti, M Reibaldi, G de Crecchio, G Cennamo
AimTo describe the vascular features of choroidal tumors using enhanced depth imaging (EDI), optical coherence tomography (OCT), and OCT-angiography.MethodsIn this prospective study, we evaluated 116 Caucasian patients with choroidal tumors (60 eyes with choroidal nevi, 40 with choroidal melanoma, 6 with choroidal hemangioma, 2 with optic disc melanocytoma, 6 with choroidal osteoma, and 2 with retinal metastases). Patients underwent a complete ophthalmic examination including bulbar echography, EDI-OCT, OCT-angiography, and multicolor imaging...
February 17, 2017: Eye
https://www.readbyqxmd.com/read/28203197/a-case-of-syphilitic-uveitis-in-which-vitreous-surgery-was-useful-for-the-diagnosis-and-treatment
#14
Takatoshi Kobayashi, Chihiro Katsumura, Hiromi Shoda, Nanae Takai, Sayako Takeda, Takako Okamoto, Koichi Maruyama, Rei Tada, Kensuke Tajiri, Teruyo Kida, Tsunehiko Ikeda
PURPOSE: To report a case of atypical syphilitic uveitis complicated with retinal vasculitis, proliferative retinopathy, and vitreous hemorrhage in which vitreous surgery was useful for the diagnosis and treatment. CASE REPORT: A 38-year-old female was referred to our hospital after noticing visual disturbance in her right eye. Fundoscopy examination of that eye revealed retinal phlebitis accompanied by retinal hemorrhage and soft exudate, and remarkable exudative changes in the retinal vessels from the upper arcade to the macula region...
January 2017: Case Reports in Ophthalmology
https://www.readbyqxmd.com/read/28196198/en-face-doppler-optical-coherence-tomography-measurement-of-total-retinal-blood-flow-in-diabetic-retinopathy-and-diabetic-macular-edema
#15
ByungKun Lee, Eduardo A Novais, Nadia K Waheed, Mehreen Adhi, Talisa E de Carlo, Emily D Cole, Eric M Moult, WooJhon Choi, Mark Lane, Caroline R Baumal, Jay S Duker, James G Fujimoto
Importance: Alterations in ocular blood flow play an important role in the pathogenesis and progression of diabetic retinopathy (DR). However, the measurement of retinal blood flow in clinical studies has been challenging. En face Doppler optical coherence tomography (OCT) provides an effective method for measuring total retinal blood flow (TRBF) in the clinic. Objective: To investigate TRBF in eyes with DR of varying severity, with or without diabetic macular edema (DME), using en face Doppler OCT...
February 9, 2017: JAMA Ophthalmology
https://www.readbyqxmd.com/read/28192497/optical-coherence-tomography-angiography-in-eyes-with-good-visual-acuity-recovery-after-treatment-for-optic-neuritis
#16
Tomoaki Higashiyama, Yasuhiro Nishida, Masahito Ohji
OBJECTIVE: To evaluate the retinal perfusion using optical coherence tomography (OCT) angiography in eyes with good visual acuity recovery after treatment for optic neuritis (ON). METHODS: Seven eyes of seven patients with good visual acuity recovery after treatment for monocular ON and seven eyes of each fellow eye used as controls were studied. Retinal perfusion around the disc and at the macula was evaluated using OCT angiography. The retinal nerve fiber layer thickness was measured around the disc...
2017: PloS One
https://www.readbyqxmd.com/read/28186181/detailed-vascular-anatomy-of-the-human-retina-by-projection-resolved-optical-coherence-tomography-angiography
#17
J P Campbell, M Zhang, T S Hwang, S T Bailey, D J Wilson, Y Jia, D Huang
Optical coherence tomography angiography (OCTA) is a noninvasive method of 3D imaging of the retinal and choroidal circulations. However, vascular depth discrimination is limited by superficial vessels projecting flow signal artifact onto deeper layers. The projection-resolved (PR) OCTA algorithm improves depth resolution by removing projection artifact while retaining in-situ flow signal from real blood vessels in deeper layers. This novel technology allowed us to study the normal retinal vasculature in vivo with better depth resolution than previously possible...
February 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28185066/optic-disc-rim-and-peripapillary-chorioretinal-atrophy-in-normal-japanese-eyes-the-kumejima-study
#18
Aiko Iwase, Shoichi Sawaguchi, Hiroshi Sakai, Kenji Tanaka, Tae Tsutsumi, Makoto Araie
PURPOSE: To report reference data for optic disc, neuroretinal rim and β-peripapillary atrophy (β-PPA) in normal Japanese. METHODS: In the Kumejima study, all participants underwent disc stereo-photography; 2208 normal subjects had good-quality disc stereo and β-PPA photographs OU. The disc and rim area and the area and angular extent of β-PPA were evaluated by computer-assisted planimetry. RESULTS: The disc, rim, and β-PPA area and its angular extent OD (OS) averaged 2...
February 9, 2017: Japanese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28182177/spontaneous-regression-of-optic-disc-pit-maculopathy-in-a-six-year-old-child
#19
Sezin Akça Bayar, Almila Sarıgül Sezenöz, Eylem Yaman Pınarcı, Gürsel Yılmaz
A 6-year-old boy with a complaint of blurred vision for two months was referred to our clinic. His visual acuity was 20/32 in the right eye and 20/20 in the left eye. Optical coherence tomography (OCT) revealed optic disc pit maculopathy in the right eye. The patient was followed for 6 months without any treatment. At the end of the 6-month period, the patient's visual acuity was 20/20 in both eyes. The OCT imaging showed spontaneous regression of the optic disc pit maculopathy. In this case report, it is concluded that in children, spontaneous regression of the optic pit maculopathy with full recovery of visual acuity is possible...
January 2017: Turkish Journal of Ophthalmology
https://www.readbyqxmd.com/read/28182175/diverse-clinical-signs-of-ocular-involvement-in-cat-scratch-disease
#20
Merih Oray, Sumru Önal, Aylin Koç Akbay, İlknur Tuğal Tutkun
OBJECTIVES: To describe ocular manifestations, diagnosis, and treatment of cat scratch disease. MATERIALS AND METHODS: Clinical records of patients with ocular cat scratch disease were reviewed. RESULTS: Thirteen eyes of 10 patients (7 female, 3 male) with a mean age of 26.9±18.5 years were included. Nine patients had a history of cat contact and had systemic symptoms associated with cat scratch disease 2-90 days prior to the ocular symptoms...
January 2017: Turkish Journal of Ophthalmology
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