Acute clouding of hydrophilic acrylic copolymer intraocular lenses:four cases report

2019 ◽  
Author(s):  
Xiaochen Wang ◽  
Yusen Huang ◽  
Xiaoming Wu
Keyword(s):  
Temperature Fluctuation ◽  
The Other ◽  
Intraocular Lenses ◽  
Transient Temperature ◽  
Acrylic Copolymer ◽  
Case Presentation ◽  
Temperature Changes ◽  
Acrylic Copolymers ◽  
Handling Methods ◽  
Phacoemulsification Cataract Surgery

Abstract Background: Intraoperative acrylic intraocular lenses (IOLs) transient clouding of several kinds of hydrophilic IOLs have been reported due to temperature changes. However, we ignored the particularity of its material and the handling methods. Case presentation: We present four cases of acute clouding of hydrophilic acrylic intraocular lenses (IOLs). Four patients underwent phacoemulsification cataract surgery with implantation of L-312, 809M, and 839M IOLs, respectively. The IOLs became opaque in varying degrees during surgery. Lens replacement was performed immediately in one case, while the cloudy IOLs were remained in the other three cases. Postoperatively, all IOLs recovered transparency. Conclusions：Temperature fluctuation was the cause of the acute opacification of these IOLs made of hydrophilic acrylic copolymers, which reminds us of attaching importance to the temperature of IOL storage and delivery in winter months. Keywords: Opacification, transient, temperature, material, cataract.

Fluorescein Staining of Intraocular Lenses

2018 ◽  
Vol 235 (04) ◽  
pp. 369-372
Author(s):  
Heinrich Gerding
Keyword(s):  
Light Transmission ◽  
Case Reports ◽  
Intraocular Lenses ◽  
Acrylic Copolymer ◽  
Fluorescein Staining ◽  
Acrylic Copolymers ◽  
Few Data ◽  
Reduced Light ◽  
Hydrophobic Acrylic ◽  
Experimental Survey

Abstract Background Recent case reports have indicated that intraocular lenses may be discoloured by systemically or locally applied fluorescein. Since very few data are available on the susceptibility of intraocular lenses to fluorescein, an experimental survey on lens discolouration was performed. Material and Methods Intraocular lenses fabricated from polmethylmethacrylate (PMMA), silicone, hydrophobic acrylic copolymers, and hydrophilic acrylic copolymers were exposed to 10% fluorescein. Staining effects were determined by standardised quantification of light transmission. Results Intraocular lenses fabricated from PMMA, silicone, or hydrophobic acrylic copolymer did not exhibit any measurable dye uptake after exposure to fluorescein. Intensive and rapid discolouration occurred in hydrophilic acrylic intraocular lenses. The transmission of blue light was reduced by 22% after 1 second and by 74% after 10 minutes of dye exposure. Conclusions The results indicate that hydrophilic acrylic intraocular lenses develop rapid and intensive discolouration and reduced light transmission after exposure to fluorescein. Lenses fabricated from other materials (PMMA, silicone, hydrophobic acrylic copolymers) were not discoloured by fluorescein staining.

Comparative Surface Imaging Study of Multifocal Diffractive Intraocular Lenses

2021 ◽  
Author(s):  
Hyeck Soo Son ◽  
Jung Min Lee ◽  
Ramin Khoramnia ◽  
Chul Young Choi
Keyword(s):  
Imaging Study ◽  
The Other ◽  
Intraocular Lenses ◽  
Optical Surface ◽  
Diffractive Optic ◽  
Atomic Force ◽  
Acceptable Range ◽  
Different Types ◽  
Concentric Pattern

Abstract Purpose To analyse and compare the surface topography and roughness of three different types of diffractive multifocal IOLs. Methods Using scanning electron microscope (SEM, Inspect F, 5.0 KV, maximum magnification up to 20,000) and atomic force microscope (AFM, Park Systems, XE-100, non-contact, area profile comparison, 10 × 10 µm, 40 × 40 µm), the surface quality of the following diffractive IOLs was studied: the AcrySof IQ PanOptix (Alcon, USA), the AT LARA 829MP (Carl Zeiss Meditec, Germany), and Tecnis Symfony (Johnson&Johnson Vision, USA). The measurements were made over three representative areas (central non-diffractive optic, central diffractive optic, and diffractive step) of each IOL. Roughness profile in terms of mean arithmetic roughness (Ra) and root-mean-squared roughness (Rq) values were obtained and compared statistically. Results In SEM examination, all IOLs showed a smooth optical surface without any irregularities at low magnification. At higher magnification, Tecnis Symfony showed unique highly regular, concentric, and lineate structures in the diffractive optic area which could not be seen in the other studied diffractive IOLs. The differences in the measured Ra and Rq values of the Tecnis Symfony were statistically significant compared to the other models (p < 0.05). Conclusion Various different topographical traits were observed in three diffractive multifocal IOLs. The Ra values of all studied IOLs were within an acceptable range. Tecnis Symfony showed statistically significant higher surface Ra values at both central diffractive optic and diffractive step areas. Furthermore, compared to its counterparts, Tecnis Symfony demonstrated highly ordered, concentric pattern in its diffractive surfaces.

scholarly journals PSV-7 Effects of drying and oxygenation of piglets at birth on rectal temperatures in the early post-natal period

2020 ◽  
Vol 98 (Supplement_3) ◽  
pp. 154-155
Author(s):  
Katherine Vande Pol ◽  
Naomi Cooper ◽  
Andres Tolosa ◽  
Michael Ellis ◽  
Richard Gates ◽  
...  
Keyword(s):  
Statistical Model ◽  
Birth Control ◽  
Rectal Temperature ◽  
Treatment Time ◽  
The Other ◽  
Experimental Unit ◽  
Potential Treatment ◽  
Temperature Changes ◽  
Oxygen Treatment ◽  
Birth Data

Abstract Piglets often experience hypothermia early after birth. Previous research has suggested that drying piglets and administration of oxygen (a potential treatment for asphyxiation) at birth may increase post-natal rectal temperatures. The objective of this study was to determine the effects of drying and administering oxygen at birth on piglet rectal temperature over the first 24 h after birth. The study, conducted at a commercial facility, used a CRD with 42 sows/litters randomly allotted at start of farrowing to 3 treatments (applied at birth): Control (no drying or oxygenation); Dried (using a cellulose-based desiccant); Dried+Oxygen [dried and placed in a chamber (40% oxygen) for 20 min]. At birth, piglets were weighed and uniquely identified. Rectal temperature was measured at 0, 20, 30, 45, 60, 120, and 1440 min after birth. Data were analyzed using PROC MIXED of SAS. Litter was the experimental unit; piglet was a subsample of litter. The statistical model included effects of treatment, time of measurement, and the interaction. Both the Dried and Dried+Oxygen treatments had greater (P &lt; 0.05) rectal temperatures than the Control between 20 and 120 min. However, the Dried+Oxygen treatment had lower (P &lt; 0.05) rectal temperatures than the Dried treatment between 20 and 60 minutes. Temperatures at 1440 min were lower (P &lt; 0.05) for the Dried+Oxygen than the other treatments; however, differences were small. In conclusion, drying piglets at birth increased rectal temperatures over the first 2 h after birth. The combination of drying piglets at birth and placement in an oxygen chamber for 20 min was less effective at moderating post-natal temperature changes than drying alone. Further research on piglet oxygenation is necessary to understand the reason for these reduced temperatures, and whether this treatment affects pre-weaning mortality. This research was funded by the National Pork Board.

scholarly journals Cloud Changes in the Period of Global Warming: the Results of the International Satellite Project

2019 ◽  
pp. 3-13
Author(s):  
O. M. Pokrovsky
Keyword(s):  
Temperature Series ◽  
The Other ◽  
Coefficient Of Determination ◽  
Smoothing Algorithm ◽  
Temperature Changes ◽  
Lower Cloud ◽  
Statistical Time ◽  
The One ◽  
The Tropics ◽  
Climatic Series

The results of analysis of climatic series of global and regional cloudiness for 1983–2009. Data were obtained in the framework of the international satellite project ISCCP. The technology of statistical time series analysis including smoothing algorithm and wavelet analysis is described. Both methods are intended for the analysis of non-stationary series. The results of the analysis show that both global and regional cloudiness show a decrease of 2–6%. The greatest decrease is observed in the tropics and over the oceans. Over land, the decrease is minimal. The correlation coefficient between the global cloud series on the one hand and the global air and ocean surface temperature series on the other hand reaches values (–0.84) — (–0.86). The coefficient of determination that characterizes the accuracy of the regression for the prediction of global temperature changes based on data on changes in the lower cloud, in this case is 0.316.

scholarly journals A case report of ultrasonographic findings in bilateral diffuse Uveal melanocytic proliferation

2020 ◽  
Vol 20 (1) ◽  
Author(s):  
Jingli Guo ◽  
Wenyi Tang ◽  
Wei Liu ◽  
Min Zhou ◽  
Qing Chang ◽  
...  
Keyword(s):  
Case Report ◽  
Retinal Detachment ◽  
High Frequency ◽  
Ciliary Body ◽  
Case Series ◽  
Ultrasound Biomicroscopy ◽  
The Other ◽  
Exudative Retinal Detachment ◽  
Case Presentation ◽  
Choroidal Nevi

Abstract Background To report undescribed characteristics of patients with bilateral diffuse uveal melanocytic proliferation (BDUMP) on ultrasound biomicroscopy (UBM) and high-frequency B-scan ultrasonography. Case presentation Two of four participants presented with worsening bilateral vision after previously diagnosed primary pulmonary or ovarian carcinoma. The other two patients were diagnosed with lung carcinoma after presentation with BDUMP. All patients had ciliary body nevi-like lesion in combination with iris or ciliary body cysts, and uveal thickening on UBM. Focally elevated choroidal nevi-like lesion and exudative retinal detachment with choroidal thickening were detected with B-scan ultrasonography. Conclusions Our case series demonstrates the uveal characteristics of patients with BDUMP based on high-frequency B-scan ultrasonography and UBM. Ultrasonographic findings are crucial in the diagnosis of BDUMP because it is occult in nature.

A Study of the Mechanical Forces on Aphakic Iris-Fixated Intraocular Lenses

2018 ◽  
Vol 140 (11) ◽  
Author(s):  
Peyman Davvalo Khongar ◽  
Jan Oscar Pralits ◽  
Paolo Soleri ◽  
Mario Romano ◽  
Rodolfo Repetto
Keyword(s):  
Point Of View ◽  
The Other ◽  
Intraocular Lenses ◽  
Mechanical Forces ◽  
Posterior Surface ◽  
Anterior Surface ◽  
Lens Dislocation ◽  
Lens Implantation ◽  
Aqueous Flow ◽  
Capsular Bag

Iris-fixated aphakic intraocular lenses (IFIOL) are used in cataract surgery when more common intraocular lenses (IOL) cannot be adopted because of the absence of capsular bag support. These lenses can be implanted on either the posterior or the anterior surface of the iris. In this work, we study whether one of these options is preferable over the other from the mechanical point of view. In particular, we focus on the forces that the IFIOL transmits to the iris, which are associated with the risk of lens dislocation. We study the problem numerically and consider aqueous flow induced by saccadic rotations in the cases of an IFIOL in the anterior and posterior sides of the iris. The considered IFIOL is the Artisan Aphakia +30.0 D lens (IFIOL) produced by Ophtec BV. We perform the simulations in openfoam. We find that the forces transmitted by the aphakic IFIOL to the iris are significantly higher in the case of posterior implantation. This suggests that lens implantation on the posterior surface of the iris might be associated with a higher risk of lens dislocation, when an inadequate amount of iris tissue is enclavated during implantation.

Inhibition of Blockage by Ice Crystal in Water in a Micro-Channel by Using Antifreeze Protein

2010 ◽  
Author(s):  
Yoshimichi Hagiwara ◽  
Yosuke Ohnishi ◽  
Daichi Yamamoto
Keyword(s):  
Flow Rate ◽  
Pure Water ◽  
Antifreeze Protein ◽  
The Other ◽  
Micro Channel ◽  
Ice Crystal ◽  
Protein Solution ◽  
Local Cooling ◽  
Solution Flow ◽  
Temperature Changes

Experiments have been conducted into the freezing of water flow and the aqueous solution flow of winter flounder antifreeze protein in a micro-channel of 0.15mm in height, 1.2mm in width and 21mm in length. The local temperature is measured with a sheathed thermocouple of 0.1mm in diameter. Nearly flat interfaces, parallel to the cooling sidewall of the channel, are observed in the case of pure water regardless of flow rate. On the other hand, serrated interfaces are observed in the case of protein solution flow regardless of flow rate. The decreasing rate of the temperature changes when the interface reaches the thermocouple. Around this instant, a slight increase in the temperature is observed due to supercooling release. In the case of local cooling, the interface becomes more serrated as the flow rate increases. This is because the interaction between the interface and the protein continuously approaching the interface due to the flow occurs more frequently with an increase in the flow rate.

scholarly journals Sprengel's Deformity Associated with Musculoskeletal Dysfunctions and Renal Anomalies: A Case Report

2012 ◽  
Vol 2012 ◽  
pp. 1-3
Author(s):  
Mohammad Hossein Kariminasab ◽  
Masoud Shayeste-Azar ◽  
Majid Sajjadi Saravi ◽  
Mehrdad Taghipour Gorgikolai
Keyword(s):  
Congenital Anomaly ◽  
Shoulder Girdle ◽  
The Other ◽  
Serratus Anterior ◽  
Renal Anomalies ◽  
Case Presentation ◽  
Rare Congenital Anomaly ◽  
Sprengel’S Deformity ◽  
Musculoskeletal Abnormalities ◽  
Cosmetic Problem

Background. Sprengel's deformity is a rare congenital anomaly of the shoulder girdle. The deformity is due to failure of descent of the scapula in intrauterine life.Case Presentation. We report a case of unilateral Sprengel's deformity associated with several other musculoskeletal and renal disorders consisting of absence of pectoralis major, weakness of trapezius and serratus anterior muscles, one kidney agenesis, and severe hydronephrosis of the other kidney in a 7-year-old boy.Conclusion. Sprengel's deformity can be associated with other musculoskeletal abnormalities and it is much more than a cosmetic problem.

Nanocomposites Based on Acrylic Copolymer, Iron Lignosulfonate and ZnO Nanoparticles Used as Wood Preservatives

2009 ◽  
Vol 151 ◽  
pp. 139-144 ◽  
Author(s):  
Lucia Dumitrescu ◽  
Dana Perniu ◽  
Ileana Manciulea
Keyword(s):  
Zno Nanoparticles ◽  
Sol Gel ◽  
Ethyl Acrylate ◽  
Wood Preservation ◽  
Acrylic Copolymer ◽  
Water Emulsion ◽  
Afm Analysis ◽  
Acrylic Copolymers ◽  
Inorganic Nanomaterials

The paper presents research concerning the synthesis and characterization of some new nanocomposite used as wood coating nanomaterials, consisting of a hybrid of organic (functionalized acrylic copolymers with iron lignosulfonate) and inorganic nanomaterials (ZnO nanoparticles obtained by sol-gel process). The presence of acrylic copolymers in water emulsion (based on monomers ethyl acrylate, butyl acrylate, acrylonitrile and the lignin derivative iron lignosulfonate) and ZnO nanoparticles enables the formation of a crosslinked nanometric network of inorganic and organic domains, emphasized by AFM analysis. The interphase characterization of the nanostructured materials synthesized was performed using FT-IR analysis. Considering the biocide activity for the acrylic copolymers, the lignin derivative iron lignosulfonate and ZnO nanoparticles, the obtained nanocomposites were biologically investigated and proposed as wood preservation agents.

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