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Search Results: 1 - 10 of 45 matches for " Komi Vonor "
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Optical Coherence Tomography’s Contribution to the Diagnosis of the Pathologies of the Vitreoretinal Interface in Lomé  [PDF]
Kossi Dzidzinyo, Hubert Yamdeu, Koffi Didier Ayena, Kokou Vonor, Nidain Maneh, Kokou Messan Amedome, Kassoula Batomaguela Nonon Saa, Koko Roger Kuaovi, Yawa Nagbe, Meba Banla, Komi Balo
Open Journal of Ophthalmology (OJOph) , 2018, DOI: 10.4236/ojoph.2018.83022
Abstract: Purpose: To identify the pathologies of the vitreoretinal interface by Optical Coherence Tomography OCT of the retina in Lomé. Methodology: This is a retrospective analytical study, carried out in a specialized liberal center in Lomé. It was based on the analysis of OCT images of the retina, carried out with patients between October 2012 and October 2014. The variables collected were the socio-demographic characteristics, which were the various pathologies of the vitreoretinal interface. Results: 303 eyes of 164 patients were analyzed. The population was predominantly female (sex ratio = 0.95) aged 9 to 84 years with an average of 52.93 years. 121 eyes (39.9%) had posterior vitreous detachment with 66.1% in the 50 - 70 age group. 42 eyes (13.86%) presented vitreomacular traction with 66.6% in the 50 - 70 age group. 31 eyes (10.23%) presented an epi-retinal membrane with 61.2% in the 50 - 70 age group. 33 eyes (10.89%) had a full-thickness macular hole with 69.6% in the 50 - 70 age group. 4 eyes had a lamellar hole and 1 eye had a pseudo hole. Conclusion: OCT is an excellent tool for non-invasive exploration of the vitreoretinal interface. It gives precise information on the various pathologies of this interface. The need to evaluate the functional impact of these abnormalities, calls for other studies, especially prospective studies to assert their reality of those disease.
Bilateral Scleral Posterior Chamber Intraocular Lens Fixation: First Case Made in Togo  [PDF]
Nidain Maneh, Mèba Banla, Komlavi Yayehd, Komi Vonor, Kassoula Batomaguela Nonon Saa, Jean Rateau, Komi Patrice Balo
Open Access Library Journal (OALib Journal) , 2015, DOI: 10.4236/oalib.1101129
Abstract: We present the case of a 65-year-old woman with an aphakia after a cataract surgery at the right eye and a pseudophakia (anterior chamber lens) at the left eye. The two eyes received an intra-ocular lens with sclera fixing of posterior chamber combined with an anterior vitrectomy. An elevated intraocular pressure of 25 mmHg and severe ocular pains were observed immediately after the surgery on the right eye. The far visual acuity (FVA) increased from counting fingers at 5 m (before the surgery) to 9/10 after the surgery refraction in the right eye. At the left eye the FVA increased from counting fingers at 2 m to 6/10. The visual functional benefit of the two eyes was satisfactory.
Retinal Damage of Hemoglobinopathies in Adults: About 181 Cases in Campus-Teaching Hospital of Lomé  [PDF]
Nidain Maneh, Koffi Didier Ayena, Kossi Brice Dzidzinyo, Kokou Vonor, Komi Patrice Balo
Open Journal of Ophthalmology (OJOph) , 2017, DOI: 10.4236/ojoph.2017.73021
Abstract: Aims: To study the frequency of sickle cell retinopathy and its severity. Material and Methods: Retrospective study over a period of 3 years (July 2013 thru June 2016) of cases of adults over 18 years old sent by the Hematology Department of the Campus-Teaching Hospital of Lomé in the context of a sickle-cell disease check-up. The parameters studied were age, sex, genotype, examination of the fundus by the Goldmann lens. The classi-fication after the fundus was in non-proliferative retinopathy and in 5 proliferative stages according to Goldberg’s classification. Results: Hundred and eighty-one patients were included with an average age of 29.39 ± 9.84. The sex ratio was 0.72 in favor of female. The SC genotype was 50.3%; SS 37.6%; CC 11% and SF 1.1%. Sickle cell retinopathy was found in 22.7% of patients, among which 14.4% were proliferative and 8.3% non-proliferative. Seventy-three percent of patients with proliferative retinopathy were SC genotype, 23% SS and 3% CC genotype. Among SC patients, 20.9% had proliferative retinopathy; 8.8% SS; and 5% CC. Fifty percent of patients with proliferative retinopathy had Goldberg’s stage ≥ 3. Conclusion: We found 22.7% of sickle cell retinopathy which proliferative form was strongly represented by the SC genotype.
Early Ophthalmological Manifestations of Crouzon Syndrome: About a Case  [PDF]
Nidain Maneh, Meba Banla, Nadiedjoa Kokou Douti, Komi Yayehd, Sophie Arsene, Ko-kou Vonor, Kassoula Batomaguela Nonon Saa, Koffi Didier Ayena, Komi Patrice Balo
Open Access Library Journal (OALib Journal) , 2014, DOI: 10.4236/oalib.1101046
Abstract: We report the case of a major neonatal form of Crouzon syndrome of ophthalmic finding in a new- born of 21 days of age with no background of consanguinity. The clinical manifestations were marked by signs of Crouzon syndrome associated with dyspnea. The skull radiograph showed a decline of maxillary and closing sutures. The brain scan was marked by a bilateral fronto-parietal hypotrophy with agnenesis of the left temporal. She had received a lateral tarsorrhaphy in prevention to keratopathy of exposure. We noted a substantive consideration of normal eye and no recurrence throttle of eyeball 6 months after tarsorrhaphy. The major forms of Crouzon syndrome is a source of complications including exposure keratopathy and optic atrophy requiring ophthalmological caring in awaiting for a craniofacial surgery.
Does Eye Camp Contribute to the Fight against Blindness? Experience of the Central Region in Togo  [PDF]
Kassoula Batomaguela Nonon Saa, Nidain Maneh, Messan Kokou Amedome, Kokou Vonor, Kossi Dzidzinyo, Koffi Didier Ayena, Komi Patrice Balo
Open Journal of Ophthalmology (OJOph) , 2017, DOI: 10.4236/ojoph.2017.73027
Abstract: Aim: To evaluate results of cataract surgery in Eye Camp in rural areas. Patients and Method: This study set about the retrospective analysis of cases and operating reports of patients over the age of 10, operated for cataract in Eye Camp and fixed strategy from January, 2010 to December, 2012. Postoperative data were specified and compared. Results: Out of a total of 1145 patients operated, 577 (50.40%) were men compared with 568 (49.60%) women. The general mean age was 62 years, similar in Eye Camp and in fixed strategy. Sixty percent of patients were operated in Eye Camp. After 4 weeks of follow-up, 77% of patients were met again, and 83% among them showed good results (corrected visual acuity = 3/10). This rate of good results was 80.43% in Eye Camp against 87.7% in fixed strategy. We noted 18.25% of complications among which 11.25% were in Eye Camp. The functional outcomes of both strategies get closer to WHO standards. Conclusion: Eye Camp in the Central Region of Togo is an interesting alternative that contributes to the fight against blindness, even if postoperative follow-up is still to be improved.
Epidemiology of Child’s Ocular Globe Injury: A Retrospective Study at the University Teaching Hospital-Campus of Lomé (Togo)  [PDF]
Nidain Maneh, Abou-Bakr Sidik Domingo, Kassoula Batomaguela Nonon Saa, Vonor Kokou, Agba Aide Isabelle, Ayena Koffi Didier, Banla Meba, Balo Komi Patrice
Open Journal of Ophthalmology (OJOph) , 2017, DOI: 10.4236/ojoph.2017.71002
Abstract: Aim: To study clinical and epidemiological characteristics of child’s ocular injuries. Patients and Method: Retrospective study on medical records of children suffering from traumatic injuries of the ocular globe presented to the Campus Teaching Hospital (CHU Campus) of Lomé from 3 January 2015 to 30 June 2016 (18 months). Age, sex, nature of the traumatising agent, consultation delay and the width of the injury (zone I, II or III), the classification of ocular trauma, according to “Birmingham Eye Trauma Terminology (BETT) system”, connected lesions have been studied. Results: Twenty children about 46.51% children presented for ocular trauma have been suffering from a globe injury. The average age was 6.68 years with the extremes of 1 year and 12 years; the age bracket of 0 - 5 years was more represented (45%); predominance was more from the female with a sex-ratio = 0.67. Eighty percent of the children were from rural areas while twenty from urban areas. The delay of consultation was less than 24 hours in 40% of cases and 15% consulted between 24 h and 72 h after the trauma. Traumatisms were entirely unilateral and penetrating within a majority of 15 (75%) cases of which a “stick” is the traumatising agent of the most frequent (40%). The seat of the injury was the zone I (85.71%) and zone II (14.29%). Connected lesions were dominated by iris hernia 7 (35%) and traumatic cataract 6 (30%). Conclusion: children’s traumas were high predominantly and they came in majority from rural zones. Prevention through awareness remains the best treatment.
A two patch prey-predator model with multiple foraging strategies in predators: Applications to Insects
Komi Messan,Yun Kang
Mathematics , 2015,
Abstract: We propose and study a two patch Rosenzweig-MacArthur prey-predator model with immobile prey and predator using two dispersal strategies. The first dispersal strategy is driven by the prey-predator interaction strength, and the second dispersal is prompted by the local population density of predators which is referred as the passive dispersal. The dispersal strategies using by predator are measured by the proportion of the predator population using the passive dispersal strategy which is a parameter ranging from 0 to 1. We focus on how the dispersal strategies and the related dispersal strengths affect population dynamics of prey and predator, hence generate different spatial dynamical patterns in heterogeneous environment. We provide local and global dynamics of the proposed model. Based on our analytical and numerical analysis, interesting findings could be summarized as follow: (1) If there is no prey in one patch, then the large value of dispersal strength and the large predator population using the passive dispersal in the other patch could drive predator extinct at least locally. However, the intermediate predator population using the passive dispersal could lead to multiple interior equilibria and potentially stabilize the dynamics; (2) For symmetric patches (i.e., all the life history parameters are the same except the dispersal strengths), the large predator population using the passive dispersal can generate multiple interior attractors; (3) The dispersal strategies can stabilize the system, or destabilize the system through generating multiple interior equilibria that lead to multiple attractors; and (4) The large predator population using the passive dispersal could lead to no interior equilibrium but both prey and predator can coexist through fluctuating dynamics for almost all initial conditions.
Quantitative Assessment of Vulnerability to Flood Hazards in Downstream Area of Mono Basin, South-Eastern Togo: Yoto District  [PDF]
Abravi Essenam Kissi, Georges Abbevi Abbey, Komi Agboka, Aklesso Egbendewe
Journal of Geographic Information System (JGIS) , 2015, DOI: 10.4236/jgis.2015.76049
Abstract: The population located along Mono River in the Yoto district faces great challenges in terms of repeated flood disasters in recent years. This paper aims at assessing the conditions which influence flood damage in the study area by using indicators to compute a Flood Vulnerability Index (FVI). The study relies on Turneret al.’s vulnerability framework and distinguishes three main components (exposure, susceptibility and resilience) that allow a more in-depth analysis and interpretation of local indicators. As a result flood disaster in the study area is not only due to the extreme variability in terms of flood magnitude and frequency in the Mono River, but also to the interaction between human and the environment. The lack of vegetation along the river bank, the closeness of households’ farmlands to the river body, the type of construction and the position of settlements, the household size, the low level education of household head, the lack of diversification of livelihood strategies, the lack of adequate flood warning system, the lack of willingness and ability to take responsive actions coupled with inadequate emergency services, are identified as main determinants increasing communities’ vulnerability to flood disaster. Furthermore, the computation of Flood Vulnerability Index (FVI) offers easy comparison of communities’ vulnerability to flood disaster and pinpoints the most vulnerable communities. At the end of the study, flood exposure, susceptibility, resilience and vulnerability maps were generated.
Optimization of the Implementation Process and Physical Properties of Cotton ( Gossipium hirsutum ) and Kenaf ( Hibiscus cannabinus L.) Wooden Chipboard  [PDF]
Sagnaba Soulama, Kokou Esso Atcholi, Bétaboalé Naon, Komi Kadja, Komla Sanda
Engineering (ENG) , 2015, DOI: 10.4236/eng.2015.712070
Abstract: The present study aims at valorizing two residues types of the foodless vegetable biomass which are abundant and very pollutant in Burkina Faso. To do it, first we try to identify the optimal values of chipboard elaboration parameters with kenaf and cotton stems by using a natural binder (the bone glue). Next we proceed to the elaboration of two panels types with optimized elaboration parameters. Besides we determine mechanical and thermal characteristics of elaborated panels with a view of an indoor thermal insulation application. Also it becomes necessary for us to determine by experimenting the thermal conductivity, Young’s modulus, Coulomb’s modulus, and the water inflation rate, taking into account some elaboration parameters on one hand and the correlation between mechanical and thermal properties on the other hand. Finally, the obtained results are compared with the panels properties values required by ANSI A 208.1-1999 standard.
A two-patch prey-predator model with dispersal in predators driven by the strength of predation
Yun Kang,Sourav Kumar Sasmal,Komi Messan
Quantitative Biology , 2015,
Abstract: Foraging movements of predator play an important role in population dynamics of prey-predator interactions, which have been considered as mechanisms that contribute to spatial self-organization of prey and predator. In nature, there are many examples of prey-predator interactions where prey is immobile while predator disperses between patches non-randomly through different factors such as stimuli following the encounter of a prey. In this work, we formulate a Rosenzweig-MacArthur prey-predator two patch model with mobility only in predator and the assumption that predators move towards patches with more concentrated prey-predator interactions. We provide completed local and global analysis of our model. Our analytical results combined with bifurcation diagrams suggest that: (1) dispersal may stabilize or destabilize the coupled system; (2) dispersal may generate multiple interior equilibria that lead to rich bistable dynamics or may destroy interior equilibria that lead to the extinction of predator in one patch or both patches; (3) Under certain conditions, the large dispersal can promote the permanence of the system. In addition, we compare the dynamics of our model to the classic two patch model to obtain a better understanding how different dispersal strategies may have different impacts on the dynamics and spatial patterns.
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