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https://www.readbyqxmd.com/read/29332157/acanthamoeba-keratitis-in-porto-alegre-southern-brazil-28-cases-and-risk-factors
#1
Denise Leal Dos Santos, Sergio Kwitko, Diane Ruschel Marinho, Bruno Schneider de Araújo, Claudete Inês Locatelli, Marilise Brittes Rott
The increasing use of contact lenses worldwide has led to an increase in cases of Acanthamoeba keratitis, which are often associated with inappropriate cleaning of contact lenses and lens cases. This study aimed to retrospectively review 28 cases of Acanthamoeba keratitis in Porto Alegre (southern Brazil) and identify the risk factors and clinical outcomes of affected patients. Most patients had higher education (66.6%), all were users of contact lenses, mostly women (67.9%). Most patients were soft contact lens wearers (66...
January 14, 2018: Parasitology Research
https://www.readbyqxmd.com/read/29332127/proteome-profiling-of-developing-murine-lens-through-mass-spectrometry
#2
Shahid Y Khan, Muhammad Ali, Firoz Kabir, Santosh Renuse, Chan Hyun Na, C Conover Talbot, Sean F Hackett, S Amer Riazuddin
Purpose: We previously completed a comprehensive profile of the mouse lens transcriptome. Here, we investigate the proteome of the mouse lens through mass spectrometry-based protein sequencing at the same embryonic and postnatal time points. Methods: We extracted mouse lenses at embryonic day 15 (E15) and 18 (E18) and postnatal day 0 (P0), 3 (P3), 6 (P6), and 9 (P9). The lenses from each time point were preserved in three distinct pools to serve as biological replicates for each developmental stage...
January 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29331294/-study-of-the-results-scleral-fixated-intraocular-lenses-in-the-absence-of-capsular-support
#3
A Benarous, A Drimbea, S Milazzo
INTRODUCTION: In the absence of sufficient capsular support, scleral fixation of the intraocular lens is an interesting alternative. The goal is to evaluate this implantation technique when traditional implantation is impossible. PATIENTS AND METHODS: This is an observational, retrospective, monocentric study at the Amiens university medical center between August 2013 and March 2016. Patients all underwent scleral fixation of a three-piece implant without suturing of the haptics, after posterior vitrectomy...
January 10, 2018: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/29331293/toric-lens-implantation-in-cataract-surgery-automated-versus-manual-horizontal-axis-marking-analysis-of-50%C3%A2-cases
#4
M Raucau, H El Chehab, E Agard, C Lagenaite, C Dot
SUBJECT: The main objective of our study was to evaluate the contribution of automated conjunctival registration in the alignment of toric intraocular lenses by comparing automated registration optimized with Callisto® to manual marking of the horizontal axis. MATERIALS AND METHODS: We performed a prospective, descriptive, monocentric study on patients undergoing cataract surgery with a toric intraocular lens (Asphina 709 Zeiss), performed by a surgeon with good experience in toric implants, between September 2016 and March 2017...
January 10, 2018: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/29331282/development-testing-and-implementation-of-a-training-curriculum-for-nonphysician-health-workers-to-reduce-cardiovascular-disease
#5
Maheer Khan, Pablo Lamelas, Hadi Musa, Jared Paty, Tara McCready, Robby Nieuwlaat, Eleonor Ng, Patricio Lopez-Jaramillo, Jose Lopez-Lopez, Khalid Yusoff, Fadhlina A Majid, Kien Keat Ng, Len Garis, Oyere Onuma, Salim Yusuf, Jon-David Schwalm
BACKGROUND: Cardiovascular disease (CVD) is the leading cause of death worldwide. The need to address CVD is greatest in low- and middle-income countries where there is a shortage of trained health workers in CVD detection, prevention, and control. OBJECTIVES: Based on the growing evidence that many elements of chronic disease management can be shifted to nonphysician health care workers (NPHW), the HOPE-4 (Heart Outcomes Prevention and Evaluation Program) aimed to develop, test, and implement a training curriculum on CVD prevention and control in Colombia, Malaysia, and low-resource settings in Canada...
January 10, 2018: Global Heart
https://www.readbyqxmd.com/read/29330666/heidegger-communication-and-healthcare
#6
Casey Rentmeester
Communication between medical professionals and patients is an important aspect of therapy and patient satisfaction. Common barriers that get in the way of effective communication in this sphere include: (1) gender, age, and cultural differences; (2) physical or psychological discomfort or pain; (3) medical literacy; and (4) distraction due to technological factors or simply being overworked. The author examines these communicative barriers from a philosophical lens and then utilizes Martin Heidegger's phenomenology and hermeneutics to provide guidance for medical professional-patient interactions...
January 12, 2018: Medicine, Health Care, and Philosophy
https://www.readbyqxmd.com/read/29329973/altered-gene-expression-in-tree-shrew-retina-and-retinal-pigment-epithelium-produced-by-short-periods-of-minus-lens-wear
#7
Li He, Michael R Frost, John T Siegwart, Thomas T Norton
Hyperopic refractive error is detected by retinal neurons, which generate GO signals through a direct emmetropization signaling cascade: retinal pigment epithelium (RPE) into choroid and then into sclera, thereby increasing axial elongation. To examine signaling early in this cascade, we measured gene expression in the retina and RPE after short exposure to hyperopia produced by minus-lens wear. Gene expression in each tissue was compared with gene expression in combined retina + RPE. Starting 24 days after normal eye opening, three groups of juvenile tree shrews (n = 7 each) wore a monocular -5 D lens...
January 9, 2018: Experimental Eye Research
https://www.readbyqxmd.com/read/29329901/effects-of-orthokeratology-on-axial-length-growth-in-myopic-anisometropes
#8
Zhi Chen, Jiaqi Zhou, Xiaomei Qu, Xingtao Zhou, Feng Xue
PURPOSE: To investigate the effect of orthokeratology (ortho-k) lens wear on axial length (AL) growth in juvenile myopic anisometropes. METHODS: This retrospective study consisted of two parts. In Part One, 25 anisometropic participants (mean age, 11.2 ± 1.9 years; 11 females and 14 males) were fitted with ortho-k lenses in the more myopic eye only, and the rate of AL growth was compared between the ortho-k lens wearing eye and the untreated contralateral eye over an average period of 23...
January 10, 2018: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/29329140/slit-lamp-needling-of-the-anterior-capsule-for-aqeuous-misdirection-post-hyaloido-zonulectomy-and-iridectomy
#9
Pierre G Mardelli, Marc E Mardelli
INTRODUCTION: We present a case of persistent aqueous misdirection post Ahmed glaucoma valve despite undergoing an anterior vitrectomy with hyaloido-zonulectomy, and iridectomy. CASE REPORT: A 73 year old female 4 months post phaco-trabeculectomy was referred with persistent high IOP. Post-operatively, she developed aqueous misdirection with a flat anterior chamber (AC) but with an IOP of 15▒mm Hg. On presentation her AC was shallow with peripheral iris-cornea touch and IOP was 39▒mm Hg...
January 11, 2018: Journal of Glaucoma
https://www.readbyqxmd.com/read/29329136/glaucoma-implant-tube-lumen-obstruction-visualized-using-anterior-segment-optical-coherence-tomography
#10
Shunsuke Nakakura, Asuka Noguchi, Santaro Noguchi, Yuka Hirose, Koji Niimi, Hitoshi Tabuchi, Yoshiaki Kiuchi
We report a case of glaucoma implant tube lumen obstruction visualized with anterior segment optical coherence tomography (ASOCT) and present its surgical management. The patient was a 66-year-old man with refractory glaucoma associated with traumatic aphakia in the right eye after trabeculectomy, several bleb needling procedures, and scleral fixation of the intraocular lens with pars plana vitrectomy. Finally, we performed Baerveldt implantation at the pars plana of the temporal inferior quadrant with a several Sherwood slit...
January 11, 2018: Journal of Glaucoma
https://www.readbyqxmd.com/read/29328296/laser-heterodyne-interferometer-with-rotational-error-compensation-for-precision-displacement-measurement
#11
Enzheng Zhang, Benyong Chen, Hao Zheng, Liping Yan, Xueying Teng
A laser heterodyne interferometer with rotational error compensation is proposed for precision displacement measurement. In this interferometer, the rotational error of the measured object is obtained by using an angle detecting unit which is composed of a semi-reflective film, a polarizing beam splitter, a quarter-wave plate, a convex lens and a two-dimensional position sensitive detector. And the obtained rotational angle is used for compensating its influence on displacement measurement result. The optical configuration of the proposed interferometer is designed, and the mathematical model for displacement measurement with rotational error compensation is established...
January 8, 2018: Optics Express
https://www.readbyqxmd.com/read/29328285/astigmatic-laser-beams-with-a-large-orbital-angular-momentum
#12
Victor V Kotlyar, Alexey A Kovalev, Alexey P Porfirev
We show that an elliptic Gaussian beam, focused by a cylindrical lens, can be represented as a linear combination of a countable number of only even angular harmonics with both positive and negative topological charge. For the orbital angular momentum (OAM) of the astigmatic Gaussian beam, an exact expression is obtained in a form of a converging series of the Legendre functions of the second kind. It is shown that at some conditions only the terms with the positive or negative topological charge are remained in this series...
January 8, 2018: Optics Express
https://www.readbyqxmd.com/read/29328257/multi-electrode-tunable-liquid-crystal-lenses-with-one-lithography-step
#13
Jeroen Beeckman, Tzu-Hsuan Yang, Inge Nys, John Puthenparampil George, Tsung-Hsien Lin, Kristiaan Neyts
Electrically tunable lenses offer the possibility to control the focal distance by applying an electric field. Different liquid crystal tunable lenses have been demonstrated. In order to minimize lens aberrations, multi-electrode designs allow us to fine-tune the applied voltages for every possible focal distance. In this Letter, we provide a novel multi-electrode design in which only one lithography step is necessary, thereby offering a greatly simplified fabrication procedure compared to earlier proposed designs...
January 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29328211/effects-of-defocus-on-the-transfer-function-of-coherence-scanning-interferometry
#14
Rong Su, Matthew Thomas, Richard Leach, Jeremy Coupland
Coherence scanning interferometry (CSI) offers three-dimensional (3D) measurement of surface topography with high precision and accuracy. Defocus within the interferometric objective lens, however, is commonly present in CSI measurements and reduces both the resolving power of the imaging system and the ability to measure tilted surfaces. This Letter extends the linear theory of CSI to consider the effects of defocus on the 3D transfer function and the point spread function in an otherwise ideal CSI instrument...
January 1, 2018: Optics Letters
https://www.readbyqxmd.com/read/29328180/modulation-transfer-function-of-a-fish-eye-lens-based-on-the-sixth-order-wave-aberration-theory
#15
Han Jia, Lijun Lu, Yiqing Cao
A calculation program of the modulation transfer function (MTF) of a fish-eye lens is developed with the autocorrelation method, in which the sixth-order wave aberration theory of ultra-wide-angle optical systems is used to simulate the wave aberration distribution at the exit pupil of the optical systems. The autocorrelation integral is processed with the Gauss-Legendre integral, and the magnification chromatic aberration is discussed to calculate polychromatic MTF. The MTF calculation results of a given example are then compared with those previously obtained based on the fourth-order wave aberration theory of plane-symmetrical optical systems and with those from the Zemax program...
January 10, 2018: Applied Optics
https://www.readbyqxmd.com/read/29328152/single-shot-dual-mode-water-immersion-microscopy-platform-for-biological-applications
#16
José Ángel Picazo-Bueno, Dan Cojoc, Federico Iseppon, Vincent Torre, Vicente Micó
A single-shot water-immersion digital holographic microscope combined with broadband (white light) illumination mode is presented. This double imaging platform allows conventional incoherent visualization with phase holographic imaging of inspected samples. The holographic architecture is implemented at the image space (that is, after passing the microscope lens), thus reducing the sensitivity of the system to vibrations and/or thermal changes in comparison to regular interferometers. Because of the off-axis holographic recording principle, quantitative phase images of live biosamples can be recorded in a single camera snapshot at full-field geometry without any moving parts...
January 1, 2018: Applied Optics
https://www.readbyqxmd.com/read/29328147/optical-diffraction-tomography-with-fully-and-partially-coherent-illumination-in-high-numerical-aperture-label-free-microscopy-invited
#17
Juan M Soto, José A Rodrigo, Tatiana Alieva
Quantitative label-free imaging is an important tool for the study of living microorganisms that, during the last decade, has attracted wide attention from the optical community. Optical diffraction tomography (ODT) is probably the most relevant technique for quantitative label-free 3D imaging applied in wide-field microscopy in the visible range. The ODT is usually performed using spatially coherent light illumination and specially designed holographic microscopes. Nevertheless, the ODT is also compatible with partially coherent illumination and can be realized in conventional wide-field microscopes by applying refocusing techniques, as it has been recently demonstrated...
January 1, 2018: Applied Optics
https://www.readbyqxmd.com/read/29328142/full-field-of-view-digital-lens-free-holography-for-weak-scattering-objects-based-on-grating-modulation
#18
Wenhui Zhang, Liangcai Cao, Guofan Jin, David Brady
Grating-based single-shot digital lens-free holography with spatial spectral multiplexing is proposed to realize full field-of-view (FOV) imaging for weak-scattering objects. Multiple object waves are generated by a one-dimensional grating that is placed in near contact with the object to avoid the cross talk among different diffraction orders during reconstruction. A multiplexed off-axis hologram is created by interference between the object waves and reference wave and captured by an image sensor in one shot...
January 1, 2018: Applied Optics
https://www.readbyqxmd.com/read/29328094/matched-and-wideband-flat-lens-antennas-using-symmetric-graded-dielectrics
#19
Mohammad Khalaj-Amirhosseini, Mohammad-Mahdi Taskhiri
Matched and wideband flat lens antennas using a two-dimensional symmetric graded dielectric (SGD) are considered. An explicit relation for refractive index of this type of antenna is presented. This design relation is obtained in two steps. The variations of refractive index are determined first in the radial direction and then in the axial direction. Additionally, reflector-lens antennas are introduced using two-dimensional SGD. The validity of design methodology is verified by simulation.
January 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29328068/indications-for-explant-of-implantable-collamer-lens
#20
M Kaur, J S Titiyal, R Falera, R Sinha, N Sharma
No abstract text is available yet for this article.
January 12, 2018: Eye
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