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https://www.readbyqxmd.com/read/28317665/preparation-of-ultrathin-grafts-for-descemet-stripping-endothelial-keratoplasty-with-a-single-microkeratome%C3%A2-pass
#1
Vito Romano, Bernhard Steger, Jayavani Myneni, Mark Batterbury, Colin E Willoughby, Stephen B Kaye
We present a technique to achieve ultrathin Descemet-stripping automated endothelial keratoplasty (DSAEK). Using a simple method of controlling artificial anterior chamber pressure and drying the corneal surface, it was possible to thin the donor cornea at a rate of 11 μm a minute. When the donor cornea was between 500 μm and 510 μm, a single pass was made using a 350 μm microkeratome head followed by a peripheral dissection. The resulting mean graft thickness was 83.2 μm ± 14.9 (SD) (range 50 to 98 μm) with a mean peripheral graft edge thickness of 106...
January 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28299439/vitamin-b12-deficiency-evaluation-and-treatment-in-severe-dry-eye-disease-with-neuropathic-ocular-pain
#2
Serkan Ozen, Murat Atabey Ozer, Mehmet Orçun Akdemir
PURPOSE: This study aims to understand the effect of vitamin B12 deficiency on neuropathic ocular pain (NOP) and symptoms in patients with dry eye disease (DED). METHODS: Patients with severe DED (without receiving topical artificial tears treatment) and ocular pain were enrolled (n = 90). Patients with severe DED and vitamin B12 deficiency (group 1, n = 45) received parenteral vitamin B12 supplement + topical treatment (artificial tears treatment + cyclosporine), and patients with severe DED and normal serum vitamin B12 level (group 2, n = 45) received only topical treatment (artificial tears treatment + cyclosporine)...
March 15, 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/28291999/-seasonal-and-perennial-allergic-rhinoconjunctivitis
#3
K Schröder, D Finis, S Meller, B A Buhren, M Wagenmann, G Geerling
Seasonsal allergic conjunctivitis (SAC) and perennial allergic conjunctivitis (PAC) as well as intermittent and persistent allergic rhinitis are widespread diseases. Because a combined occurrence of ocular and nasal symptoms is very common the summarising term allergic rhinoconjunctivitis is frequently used. SAC and PAC representing the two acute forms of allergic conjunctivitis account for more than 90% of all cases of allergic conjunctivitis. Compared to the chronic forms of allergic conjunctivitis their course of disease is milder...
February 2017: Laryngo- Rhino- Otologie
https://www.readbyqxmd.com/read/28291455/measuring-hemodynamic-changes-in-the-ophthalmic-artery-during-applied-force-for-noninvasive-intracranial-pressure-monitoring-test-results-in-a-porcine-model
#4
Max Twedt, Chase Pfeifer, William Thorell, Greg Bashford
Possible traumatic brain injury victims would greatly benefit from a handheld, noninvasive intracranial pressure (ICP) monitoring tool, which a medic could operate in a remote area. Such a device would also benefit the transport of injured soldiers during en route medical care and critical care air transport. This study demonstrates the use of noninvasive blood flow measurements in the eye by ultrasound as a proxy for ICP. ICP was artificially raised in a porcine model and resultant blood flow change in the ophthalmic artery was measured...
March 2017: Military Medicine
https://www.readbyqxmd.com/read/28291206/-potential-for-use-of-hydroxypropyl-guar-in-tear-substitute-therapy
#5
V V Brzhesky, S Yu Golubev
Of the large number of polymers used in artificial tear formulations, natural polysaccharides - hydroxypropyl guar, sodium hyaluronate, chondroitin sulfate, dextran, etc., are gaining more and more popularity. Hydroxypropyl guar stands out through its ability to form a long-lasting structured matrix adhered to the damaged ocular surface and ensuring good wettability of the latter and regeneration of epithelial cells. At that, the viscosity of hydroxypropyl guar increases with increasing tear pH (which, in turn, correlates with the severity of xerosis) and further prolongs the moisturizing effect...
2017: Vestnik Oftalmologii
https://www.readbyqxmd.com/read/28287768/eye-movements-in-implicit-artificial-grammar-learning
#6
Susana Silva, Filomena Inácio, Vasiliki Folia, Karl Magnus Petersson
Artificial grammar learning (AGL) has been probed with forced-choice behavioral tests (active tests). Recent attempts to probe the outcomes of learning (implicitly acquired knowledge) with eye-movement responses (passive tests) have shown null results. However, these latter studies have not tested for sensitivity effects, for example, increased eye movements on a printed violation. In this study, we tested for sensitivity effects in AGL tests with (Experiment 1) and without (Experiment 2) concurrent active tests (preference- and grammaticality classification) in an eye-tracking experiment...
March 13, 2017: Journal of Experimental Psychology. Learning, Memory, and Cognition
https://www.readbyqxmd.com/read/28280333/proteomic-analysis-of-tears-following-acupuncture-treatment-for-menopausal-dry-eye-disease-by-two-dimensional-nano-liquid-chromatography-coupled-with-tandem-mass-spectrometry
#7
Qingyu Liu, Junling Liu, Chengda Ren, Wenting Cai, Qingquan Wei, Yi Song, Jing Yu
BACKGROUND: The purpose of this study was to investigate whether acupuncture is effective at treating dry eye disease among postmenopausal women and to identify the possible mechanisms. METHODS: Twenty-eight postmenopausal women with dry eye disease were randomly divided into two groups: an acupuncture plus artificial tears (AC + AT) group and an artificial tears (AT) only group. After baseline examination of clinical parameters and tear sample collection, each patient received the designated modality of topical therapy for 2 months...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28272105/can-we-improve-the-tolerance-of-an-ocular-prosthesis-by-enhancing-its-surface-finish
#8
Andre S Litwin, Emma Worrell, Jonathan C P Roos, Barry Edwards, Raman Malhotra
PURPOSE: Patients who wear an ocular prosthesis frequently suffer with dry eye symptoms and socket discharge, often on a daily basis. The aim of the study was to determine whether a smoother, optical quality polish of the prosthesis' surface could improve symptoms and wear tolerance. The study was designed as single-center, single-masked, prospective randomized controlled trial. Eighty-eight consecutive patients undergoing annual ocular prosthesis maintenance review were approached from the prosthesis clinic...
March 7, 2017: Ophthalmic Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28271538/the-lack-of-relation-between-straylight-and-visual-acuity-two-domains-of-the-point-spread-function
#9
Thomas J T P van den Berg
PURPOSE: The effect of cataract and other media opacities on functional vision is typically assessed clinically using visual acuity. In both clinical and basic research, straylight (the functional result of light scattering in the eye) is commonly measured. The purpose of the present study was to determine the link between these two measures: is visual acuity in cataract and other media opacities related to straylight? METHODS: Interdependence between acuity and straylight is addressed from three different points of view: (1) Methodological: can acuity differences affect the measurement value of straylight, and vice versa? (2) Basic optics: does the optical process of light scattering in the human eye affect both straylight and visual acuity? (3) Statistical: how strongly are acuity and straylight correlated in the practice of important clinical conditions? Experimental and theoretical aspects will be considered, with a focus on normal ageing and cataract formation...
March 8, 2017: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/28264639/a-multiple-plasticity-spiking-neural-network-embedded-in-a-closed-loop-control-system-to-model-cerebellar-pathologies
#10
Alice Geminiani, Claudia Casellato, Alberto Antonietti, Egidio D'Angelo, Alessandra Pedrocchi
The cerebellum plays a crucial role in sensorimotor control and cerebellar disorders compromise adaptation and learning of motor responses. However, the link between alterations at network level and cerebellar dysfunction is still unclear. In principle, this understanding would benefit of the development of an artificial system embedding the salient neuronal and plastic properties of the cerebellum and operating in closed-loop. To this aim, we have exploited a realistic spiking computational model of the cerebellum to analyze the network correlates of cerebellar impairment...
January 10, 2017: International Journal of Neural Systems
https://www.readbyqxmd.com/read/28248989/efficacy-of-two-different-thiol-modified-crosslinked-hyaluronate-formulations-as-vitreous-replacement-compared-to-silicone-oil-in-a-model-of-retinal-detachment
#11
Sven Schnichels, Nele Schneider, Christine Hohenadl, José Hurst, Andreas Schatz, Kai Januschowski, Martin S Spitzer
The efficacy of two novel artificial vitreous body substitutes (VBS) consisting of highly biocompatible thiolated cross-linked hyaluronic acid (HA)-based hydrogels in comparison to silicone oil in a model of retinal detachment was investigated. Pars plana vitrectomy (23G) was performed in the right eye of 24 pigmented rabbits. Retinal detachment of two quadrants was induced by creating a small retinotomy near the vascular arcade and injecting balanced salt solution (BSS) subretinally. The retina was reattached by injecting air, which was followed by increasing the infusion pressure, and the retinal tear was treated by endolaser photocoagulation...
2017: PloS One
https://www.readbyqxmd.com/read/28245347/autologous-serum-eye-drops-for-dry-eye
#12
REVIEW
Qing Pan, Adla Angelina, Michael Marrone, Walter J Stark, Esen K Akpek
BACKGROUND: Theoretically, autologous serum eye drops (AS) offer a potential advantage over traditional therapies on the assumption that AS not only serve as a lacrimal substitute to provide lubrication but contain other biochemical components that allow them to mimic natural tears more closely. Application of AS has gained popularity as second-line therapy for patients with dry eye. Published studies on this subject indicate that autologous serum could be an effective treatment for dry eye...
February 28, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28244934/repeatability-of-central-corneal-thickness-measurement-using-rotating-scheimpflug-camera-in-dry-and-normal-eyes
#13
Jong-Hyuck Lee, Jae Hyuck Kim, Sun Woong Kim
PURPOSE: To compare the repeatability of central corneal thickness (CCT) measurement using the Pentacam between dry eyes and healthy eyes, as well as to investigate the effect of artificial tears on CCT measurement. METHODS: The corneal thicknesses of 34 patients with dry eye and 28 healthy subjects were measured using the Pentacam. One eye from each subject was assigned randomly to a repeatability test, wherein a single operator performed three successive CCT measurements time points-before and 5 min after instillation of one artificial teardrop...
February 27, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/28241623/hybrid-imprinting-process-to-fabricate-a-multi-layer-compound-eye-for-multispectral-imaging
#14
Jianwei Chen, Hiu Hung Lee, Dongping Wang, Si Di, Shih-Chi Chen
We present a high-precision hybrid imprinting method to fabricate multi-layer micro-optical structures on nonplanar substrates using a custom-built vacuum imprinting system; with the application of kinematic couplings that align the flexible stamps in all six degrees of freedom, a cross-layer pattern registration precision of 400 nm has been achieved on nonplanar substrates. To demonstrate the precision and feasibility of the new process and instrument, we have designed and fabricated a multi-layer artificial compound eye (ACE) for multispectral imaging...
February 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28237389/over-the-counter-otc-artificial-tear-drops-for-dry-eye-syndrome-a-cochrane-review-summary
#15
Loendi van der Westhuizen, Andrew D Pucker
No abstract text is available yet for this article.
November 17, 2016: International Journal of Nursing Studies
https://www.readbyqxmd.com/read/28222021/intense-blue-light-therapy-during-the-night-time-does-not-suppress-the-rhythmic-melatonin-biosynthesis-in-a-young-boy
#16
K Stebelova, J Kosnacova, M Zeman
OBJECTIVE: Melatonin is a hormone predominantly synthesized and secreted during the night by the pineal gland. Artificial light at night, especially its blue part, acutely suppresses the melatonin production. Th e aim of the present study was to find out, whether an intense blue light phototherapy of severe hyperbilirubinemia, may suppress the melatonin production during the night when the eyes will be properly protected by a sleep mask. METHODS: The main melatonin metabolite, 6-sulphatoxymelatonin was measured in urine in a nine-year old boy suffering from the Crigler-Najjar syndrome type I...
January 1, 2017: Endocrine Regulations
https://www.readbyqxmd.com/read/28216852/a-simplified-approach-to-rehabilitate-an-ocular-defect-ocular-prosthesis
#17
Darshana Choubisa
A 42-year-old male patient complaint with missing right eye was referred to the Department of Prosthodontics and Crown and Bridge. This patient was seeking artificial eye replacement. On careful clinical examination, a defect with a shrunken orbit and intact tissue bed was found in the patient. As the patient was economically very poor, modified stock ocular prosthesis was advised. To rehabilitate this ocular defect, "single" appointment technique with clinically available material was adopted, which is discussed in the present communication...
January 2017: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/28207920/paper-based-microfluidic-system-for-tear-electrolyte-analysis
#18
Ali K Yetisen, Nan Jiang, Ali Tamayol, Guillermo U Ruiz-Esparza, Yu Shrike Zhang, Sofía Medina-Pando, Aditi Gupta, James S Wolffsohn, Haider Butt, Ali Khademhosseini, Seok-Hyun Yun
The analysis of tear constituents at point-of-care settings has a potential for early diagnosis of ocular disorders such as dry eye disease, low-cost screening, and surveillance of at-risk subjects. However, current minimally-invasive rapid tear analysis systems for point-of-care settings have been limited to assessment of osmolarity or inflammatory markers and cannot differentiate between dry eye subclassifications. Here, we demonstrate a portable microfluidic system that allows quantitative analysis of electrolytes in the tear fluid that is suited for point-of-care settings...
March 14, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28197326/efficacy-of-carboxymethylcellulose-and-hyaluronate-in-dry-eye-disease-a-systematic-review-and-meta-analysis
#19
Jae Kyeong Song, Kiheon Lee, Hwa Yeon Park, Joon Young Hyon, Seung-Won Oh, Woo Kyung Bae, Jong-Soo Han, Se Young Jung, Yoo Jin Um, Ga-Hye Lee, Ji Hye Yang
BACKGROUND: The efficacy of two artificial tears, carboxymethylcellulose (CMC) and hyaluronate (HA), was compared in the treatment of patients with dry eye disease. METHODS: We conducted a systematic review and meta-analysis on randomized controlled trials in the PubMed, Embase, Cochrane Library, and ClinicalTrials.gov databases. The efficacy was compared in terms of the mean change from baseline in tear break-up time. The meta-analysis was conducted using both random and fixed effect models...
January 2017: Korean Journal of Family Medicine
https://www.readbyqxmd.com/read/28181718/segmented-sleep-in-a-nonelectric-small-scale-agricultural-society-in-madagascar
#20
David R Samson, Melissa B Manus, Andrew D Krystal, Efe Fakir, James J Yu, Charles L Nunn
OBJECTIVES: We studied sleep in a rural population in Madagascar to (i) characterize sleep in an equatorial small-scale agricultural population without electricity, (ii) assess whether sleep is linked to noise levels in a dense population, and (iii) examine the effects of experimentally introduced artificial light on sleep timing. METHODS: Using actigraphy, sleep-wake patterns were analyzed for both daytime napping and nighttime wakefulness in 21 participants for a sum total of 292 days...
February 9, 2017: American Journal of Human Biology: the Official Journal of the Human Biology Council
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