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https://www.readbyqxmd.com/read/28641253/a-closed-form-solution-to-single-underwater-camera-calibration-using-triple-wavelength-dispersion-and-its-application-to-single-camera-3d-reconstruction
#1
Xida Chen, Yee-Hong Yang
In this paper, we present a new method to estimate the housing parameters of an underwater camera by making full use of triple wavelength dispersion. Our method is based on an important finding that there is a closed-form solution to the distance from the camera center to the refractive interface once the refractive normal is known. The correctness of this finding is mathematically proved in this paper. To our best knowledge, such a finding has not been studied or reported, and hence is never proved theoretically...
June 16, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28635294/tunable-anisotropic-photon-emission-from-self-organized-cspbbr3-perovskite-nanocrystals
#2
Matthew Jurow, Thomas Lampe, Erika Penzo, Jun Kang, Matthew A Koc, Thomas Zechel, Zachary Nett, Michael A Brady, Lin-Wang Wang, A Paul Alivisatos, Stefano Cabrini, Wolfgang Brutting, Yi Liu
We report controllable anisotropic light emission of photons originating from vertically aligned transition dipole moments in spun-cast films of CsPbBr3 nanocubes. By depositing films of nanocrystals on pre-coated substrates we can control the packing density and resultant radiation pattern of the emitted photons. We develop a technical framework to calculate the average orientation of light emitters, i.e. the angle between the transition dipole moment vector (TDM) and the substrate. This model is applicable to any emissive material with a known refractive index...
June 21, 2017: Nano Letters
https://www.readbyqxmd.com/read/28634928/comparison-of-formulas-and-methods-for-high-myopia-patients-requiring-intraocular-lens-powers-less-than-six-diopters
#3
Harry S Geggel
PURPOSE: To determine the best method to minimize postoperative hyperopia and achieve mild myopia in patients requiring low-powered (<6.00 D) MN60MA intraocular lenses (IOLs). METHODS: This retrospective non-comparative case series consists of 32 eyes (20 patients). Postoperative spherical equivalent (SE) refractions were compared using four methods: standard formulas with varying target refractions (Haigis -1.00 D, Hoffer Q -1.75 D, Holladay 1 -1.50 D and SRK/T -1...
June 20, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28632403/effect-of-amblyopia-treatment-on-choroidal-thickness-in-children-with-hyperopic-anisometropic-amblyopia
#4
Seray Aslan Bayhan, Hasan Ali Bayhan
PURPOSE: To evaluate choroidal thickness (CT) in the eyes of children with hyperopic anisometropic amblyopia and to assess changes in CT during amblyopia treatment using spectral-domain optical coherence tomography (SD-OCT). METHODS: This longitudinal study, initially enrolled 40 patients, aged 3-9 years with hyperopic anisometropic amblyopia. Patients underwent treatment with refractive correction alone for 16 weeks and if needed, with refractive correction and patching treatment thereafter (6 months)...
June 20, 2017: Current Eye Research
https://www.readbyqxmd.com/read/28632153/fabrication-and-characterization-of-plasmonic-nanopores-with-cavities-in-the-solid-support
#5
Bita Malekian, Kunli Xiong, Gustav Emilsson, Jenny Andersson, Cecilia Fager, Eva Olsson, Elin M Larsson-Langhammer, Andreas B Dahlin
Plasmonic nanostructures are widely used for various sensing applications by monitoring changes in refractive index through optical spectroscopy or as substrates for surface enhanced Raman spectroscopy. However, in most practical situations conventional surface plasmon resonance is preferred for biomolecular interaction analysis because of its high resolution in surface coverage and the simple single-material planar interface. Still, plasmonic nanostructures may find unique sensing applications, for instance when the nanoscale geometry itself is of interest...
June 20, 2017: Sensors
https://www.readbyqxmd.com/read/28631305/two-years-results-of-small-incision-lenticule-extraction-and-wavefront-guided-laser-in%C3%A2-situ-keratomileusis-for-myopia
#6
Hidenaga Kobashi, Kazutaka Kamiya, Akihito Igarashi, Masahide Takahashi, Kimiya Shimizu
PURPOSE: To compare the 2-years visual and refractive outcomes between small-incision lenticule extraction (SMILE) and wavefront-guided laser in situ keratomileusis (LASIK) in eyes with myopia and myopic astigmatism. METHODS: Our retrospective case-control study examined 30 eyes of 30 patients with the manifest refraction spherical equivalent (MRSE) of -3.71 ± 1.83 dioptres (D) who underwent SMILE and 30 eyes of 30 patients with MRSE of -3.81 ± 1.40 D who underwent wavefront-guided LASIK...
June 20, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/28630786/ophthoselfie-detailed-self-imaging-of-cornea-and-anterior-segment-by-smartphone
#7
Abdullah Kaya
OBJECTIVES: To describe the ophthoselfie, a method by which everyone can take detailed self-images of the cornea and anterior segment with a smartphone. MATERIALS AND METHODS: A 90-diopter non-contact double aspheric lens was attached to posterior camera of the smartphone by clear tape. Images of one eye on the screen of the smartphone could be seen with the other eye in the mirror and images were taken. RESULTS: Accurate and detailed images of the cornea and anterior segment of the eye could be taken...
June 2017: Turkish Journal of Ophthalmology
https://www.readbyqxmd.com/read/28628503/influence-of-refractive-status-on-the-higher-order-aberration-pattern-after-small-incision-lenticule-extraction-surgery
#8
Liuyang Li, George P M Cheng, Alex L K Ng, Tommy C Y Chan, Vishal Jhanji, Yan Wang
PURPOSE: To study the effect of myopia on the pattern change in higher-order aberrations after small incision lenticule extraction. METHODS: Sixty eyes of 60 patients were included: low myopia (≤-3.00 D), moderate myopia (-3.00 D to -6.00 D), and high myopia (≥-6.00 D). Total higher-order aberrations (tHOA), vertical coma (C3), horizontal coma (C3), and spherical aberration (C4) were measured preoperatively and at postoperative 3 months. RESULTS: At the end of 3 months, tHOA changed significantly compared with the preoperative values (P < 0...
June 14, 2017: Cornea
https://www.readbyqxmd.com/read/28628489/shifting-of-the-line-of-sight-in-tilted-disk-syndrome
#9
Pinar Kosekahya, Ozge Sarac, Mustafa Koc, Mehtap Caglayan, Gozde Hondur, Nurullah Cagil
OBJECTIVES: To investigate the shifting of the line of sight (LoS) and the refractive, topographic, and aberrometric parameters that may be associated with the shifting of the LoS in eyes with tilted disk syndrome (TDS). METHODS: Eighty left eyes of 80 subjects with TDS (Study Group) and 70 left eyes of 70 subjects with myopia and astigmatism (Control Group) were included in this study. Line-of-sight coordinates on the horizontal (x) and vertical (y) axes, refractive, topographic, and aberrometric parameters were evaluated...
June 16, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/28626823/a-survey-of-ophthalmologists-and-gynecologists-regarding-termination-of-pregnancy-and-choice-of-delivery-mode-in-the-presence-of-eye-diseases
#10
Seyed-Farzad Mohammadi, Mojgan Letafat-Nejad, Elham Ashrafi, Hanieh Delshad-Aghdam
PURPOSE: To evaluate and compare the attitudes of ophthalmologists and gynecologists in suggesting appropriate approach to pregnancy in different ocular conditions. METHODS: Specialty-specific questionnaires on delivery mode and abortion indications for ophthalmic patients (refractive, vascular, oncologic, retinal, glaucoma, postoperation, posttrauma, and infectious) were designed and distributed among physician staff of Farabi Eye Hospital and Yas Women Hospital in Tehran...
June 2017: Journal of Current Ophthalmology
https://www.readbyqxmd.com/read/28626818/astigmatic-treatment-with-photorefractive-keratectomy-investigations-of%C3%A2-non-keratometric-ocular-astigmatism
#11
Alireza Peyman, Zahra Dastborhan, Mohammadreza Peyman
PURPOSE: To evaluate the effect of non-keratometric ocular astigmatisms on visual and refractive outcomes after photorefractive keratectomy (PRK) for correction of myopic astigmatisms. METHODS: Seventy one eyes of 36 subjects were enrolled in this study. Patients underwent PRK for treatment of myopia. Subjects were evaluated for refractive error, keratometry, and visual acuity before and six months after surgery. Pre- and post-op non-keratometric astigmatisms were calculated by vectorial analysis of the difference between the corneal plane refractive astigmatism and keratometric astigmatism...
June 2017: Journal of Current Ophthalmology
https://www.readbyqxmd.com/read/28625971/peripheral-leptochoroid-clinical-and-anatomical-findings
#12
Jasmine H Francis, Larissa A Habib, David H Abramson
BACKGROUND/AIMS: To investigate the clinical findings and anatomical characteristics of patients with a thinned peripheral choroid (leptochoroid) presenting with bilateral macular geographical hyperpigmented fundus and compare with matched controls. METHODS: A retrospective, observational case series of 44 eyes (24 patients): 22 study eyes (12 study patients) with clinical findings of leptochoroid (geographical hyperpigmented fundus centred in the macula) matched with 22 control eyes (12 control patients)...
June 16, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28624726/holographic-characterization-of-contaminants-in-water-differentiation-of-suspended-particles-in-heterogeneous-dispersions
#13
Laura A Philips, David B Ruffner, Fook Chiong Cheong, Jaroslaw M Blusewicz, Priya Kasimbeg, Basma Waisi, Jeffrey R McCutcheon, David G Grier
Determining the size distribution and composition of particles suspended in water can be challenging in heterogeneous multicomponent samples. Light scattering techniques can measure the distribution of particle sizes, but provide no basis for distinguishing different types of particles. Direct imaging techniques can categorize particles by shape, but offer few insights into their composition. Holographic characterization meets this need by directly measuring the size, refractive index, and three-dimensional position of individual particles in a suspension...
June 7, 2017: Water Research
https://www.readbyqxmd.com/read/28624326/randomized-trial-on-illuminated-microcatheter-circumferential-trabeculotomy-versus-conventional-trabeculotomy-in-congenital-glaucoma
#14
Jyoti Shakrawal, Shveta Bali, Talvir Sidhu, Saurabh Verma, Ramanjit Sihota, Tanuj Dada
PURPOSE: To compare one year outcomes of illuminated microcatheter-assisted circumferential trabeculotomy(IMCT) vs conventional partial trabeculotomy(CPT) for Primary Congenital Glaucom (PCG). DESIGN: Randomized clinical trial METHODS: Forty eyes of 31 patients with unilateral or bilateral primary congenital glaucoma aged less than two years were randomized to undergo IMCT (20 eyes) or CPT (20 eyes). Primary outcome measure was IOP reduction. The success criterion was defined as intraocular pressure (IOP) ≤ 12 mm Hg without and with anti-glaucoma medications (absolute success and qualified success respectively)...
June 14, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28624324/risk-factors-for-rapid-glaucoma-disease-progression
#15
Thomas Chun Wai Chan, Chandra Bala, Anna Siu, Fiona Wan, Andrew White
PURPOSE: To determine the intraocular and systemic risk factor differences between a cohort of rapid glaucoma disease progressors and non-rapid disease progressors. DESIGN: Retrospective case control study Methods SETTING: Five private ophthalmology clinics STUDY POPULATION: 48 rapidly progressing eyes (progression ≥1dB mean deviation (MD)/year) and 486 non-rapidly progressing eyes (progression <1dB MD/year). Patients were eligible if they had a diagnosis of glaucoma from their ophthalmologist and if they had greater than or equal to 5 Humphrey visual fields (24-2) conducted...
June 14, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28624314/anatomical-and-refractive-outcomes-in-patients-with-treated-retinopathy-of-prematurity
#16
M Lolas, A Tuma, M Zanolli, R Agurto, R Stevenson, D Ossandón
OBJECTIVE: To describe the anatomical and refractive outcomes after treatment with intravitreal bevacizumab or laser in a patient cohort with retinopathy of prematurity (ROP). METHODS: A multicentre, prospective, and observational study was performed on patients with ROP treated at Hospital Roberto del Río. Those patients with less than 6months of follow-up were excluded. Cases with posterior zone II, zone I ROP, and aggressive posterior ROP (AP-ROP) were treated with intravitreal bevacizumab...
June 14, 2017: Archivos de la Sociedad Española de Oftalmología
https://www.readbyqxmd.com/read/28624312/non-lens-based-surgical-techniques-for-presbyopia-correction
#17
R Bilbao-Calabuig, F Llovet-Osuna
INTRODUCTION: Presbyopia is the most prevalent refractive error. With a progressive aging population, its surgical correction is an important challenge for the ophthalmology community, as well as the millions of patients who suffer from it, and who are increasingly demanding alternatives to its correction with glasses or contact lenses. MATERIAL AND METHODS: A review is presented with a synthesised discussion on the pathophysiological theories of presbyopia and an updated and analytical description of the non-lens involvement surgical techniques used to treat presbyopia...
June 14, 2017: Archivos de la Sociedad Española de Oftalmología
https://www.readbyqxmd.com/read/28622580/combating-breast-cancer-with-non-steroidal-aromatase-inhibitors-nsais-understanding-the-chemico-biological-interactions-through-comparative-sar-qsar-study
#18
REVIEW
Nilanjan Adhikari, Sk Abdul Amin, Achintya Saha, Tarun Jha
It is a challenging task to design target-specific and less toxic non-steroidal aromatase inhibitors (NSAIs) though the modeling studies for designing anti-aromatase molecules have been continuing for more than two decades to fight the dreaded estrogen-dependent breast cancer. In this article, different validated QSAR models are developed and analyzed to understand important physicochemical and structural parameters modulating the aromatase inhibitory activity of NSAIs. Physicochemical properties such as molar refractivity and dipole moment are found to be the most important parameters for controlling aromatase inhibition...
May 30, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28622398/axial-length-variation-impacts-on-superficial-retinal-vessel-density-and-foveal-avascular-zone-area-measurements-using-optical-coherence-tomography-angiography
#19
Danuta M Sampson, Peijun Gong, Di An, Moreno Menghini, Alex Hansen, David A Mackey, David D Sampson, Fred K Chen
Purpose: To evaluate the impact of image magnification correction on superficial retinal vessel density (SRVD) and foveal avascular zone area (FAZA) measurements using optical coherence tomography angiography (OCTA). Methods: Participants with healthy retinas were recruited for ocular biometry, refraction, and RTVue XR Avanti OCTA imaging with the 3 × 3-mm protocol. The foveal and parafoveal SRVD and FAZA were quantified with custom software before and after correction for magnification error using the Littman and the modified Bennett formulae...
June 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28622329/plastic-modification-of-the-cornea-by-pneumatic-force-corrects-myopia-pneumatic-keratology
#20
A Medina
PurposeThe eyeball and, in particular, the cornea deform in vitro by the application of a distending force like other visco-elastic tissue. If the force is large enough, the cornea strains beyond the elastic range, and a permanent deformation occurs. Such permanent strain is referred to as 'plastic' strain. The phenomenon, however, has never been observed or produced on living tissue. This report seeks to demonstrate that the central radius of a patient's cornea can be altered in a controlled manner designed to correct refractive errors...
June 16, 2017: Eye
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