Search results for "Ulls"
showing 10 items of 54 documents
Intrasession and Intersession Repeatability of a new PCT-200 Corneal Topographer on Calibrated Steel Surfaces and Healthy Eyes
2010
PURPOSE: To assess intrasession and intersession repeatability of a new tilted-cone, Placido-disc based corneal topographer (PCT-200, Optopol Tech., Poland) on calibrated steel surfaces and healthy human eyes. METHODS: Five repeated measures of surface topography were obtained on a set of four different calibrated steel spherical surfaces and on a sample 30 healthy human eyes in each of two sessions. Variance of apical radius, eccentricity and Fourier Indices was assessed both within and between sessions using analysis of variance (ANOVA), paired samples t-test and intraclass correlation coefficients (ICC). RESULTS: Repeated measurements on calibrated steel surfaces and human eye sample of …
Schematic eye models to mimic the behavior of the accommodating human eye
2018
A simplified version of the human eye is known as schematic eye model. Since the first attempts in the middle of the 19th century, numerous approaches describing new schematic eye models have been introduced. Some of them are able to describe the accommodation ability of the human eye. Accommodative schematic eyes could be of great interest since they are able to explain the functionality of the human eye and they can be easily used for different research purposes. Some of these include the design and testing of multifocal ophthalmic solutions, evaluation of the effect of optical aberrations on the retinal image quality, and study of the optical performance of the eye at different distances…
Binocular vision alterations after refractive and cataract surgery: a review.
2018
To review binocular and accommodative disorders documented after corneal or intraocular refractive surgery, in normal healthy prepresbyopic patients. A bibliographic revision was performed; it included works published before 1st July 2017 where accommodation and/or binocularity was assessed following any type of refractive surgical procedure. The search in Pubmed yielded 1273 papers, 95 of which fulfilled the inclusion criteria. Few publications reporting binocular vision and/or accommodative changes after refractive surgery in normal subjects were found. The reduction in fusional vergence is the most frequently reported alteration. Anisometropia is an important risk factor for postoperativ…
Bacterial Contamination of Anterior Chamber Fluid Following Non-complicated Cataract Surgery
1993
Objective: To study the anterior chamber contamination during non-complicated cataract surgery and its relationship with normal conjuctival organisms. Setting: Ophthalmology Department, La Fe Hospital, University of Valencia. Patients: Forty patients who had undergone cataract extraction using either ECCE, phacoemulsification or nucleus fracture methods. Results: Positive cultures of aqueous humour were obtained in 32.5% of cases. The most commonly isolated organism was Staphylococcus coagulase-negative. Only in 7.7% of cases was the microorganism found in the conjunctiva the same as that found in the anterior chamber. The inoculum size ranged between 20 and 160 colonies/ml. One of the case…
Recommendations for ophthalmologic practice during the easing of COVID‐19 control measures
2021
Abstract In the context of the COVID‐19 pandemic, this paper provides recommendations for medical eye care during the easing of control measures after lockdown. The guidelines presented are based on a literature review and consensus among all Spanish Ophthalmology Societies regarding protection measures recommended for the ophthalmologic care of patients with or without confirmed COVID‐19 in outpatient, inpatient, emergency and surgery settings. We recommend that all measures be adapted to the circumstances and availability of personal protective equipment at each centre and also highlight the need to periodically update recommendations as we may need to readopt more restrictive measures de…
Variations of OCT measurements corrected for the magnification effect according to axial length and refractive error in children
2018
Purpose: The aim of this paper was to examine the distribution of macular, retinal nerve fiber layer (RNFL) thickness and optic disc parameters of myopic and hyperopic eyes in comparison with emmetropic control eyes and to investigate their variation according to axial length (AL) and spherical equivalent (SE) in healthy children. Methods: This study included 293 pairs of eyes of 293 children (145 boys and 148 girls), ranging in age from 6 to 17 years. Subjects were divided according to SE in control (emmetropia, 99 children), myopia (100 children) and hyperopia (94 children) groups and according to axial AL in 68 short ([Formula: see text]22.00[Formula: see text]mm, 68), medium (from [For…
Esthesioneuroblastoma presenting with epifora in a young child
1997
Esthesioneuroblastoma (ENB) is an uncommon tumor believed to arise from the olfactory epithelium. 1 This neoplasm has rarely been reported in children, with only 12 cases reported to date among patients younger than 10 years. 2 The usual initial symptom in children, as in older patients, is nasal obstruction or epistaxis 3 ; consequently, the tumor is often first seen by an otorhinolaryngologist. We report a case of ENB in a young child in whom the initial symptom was epiphora; to our knowledge, this initial symptom is previously unreported, and ENB must now be considered in the differential diagnosis of epiphora in childhood. Report of a Case. A white 6-year-old male child was seen on Janu…
Fulls de dietari. Un estiu amb Epicur
2016
En el número 51 de la revista L'Espill trobaràs un dossier monogràfic sobre "Consideracions intempestives sobre els Països Catalans", amb contribucions d'Antoni Furió, Gustau Muñoz, Pau Viciano, Ferran Garcia-Oliver i Antoni Rico. A més, articles de Salvador Giner, Terry Eagleton, Georgi K. Marinov, Paola Lo Cascio, Toni Mollà, Gonçal López Pampló i Àlex Broch, així com la correspondència entre Josep Iborra i Josep Garcia Richart, un full de dietari d'Enric Balaguer i una conversa amb Josep Piera, per Ferran Garcia-Oliver.
Fulls de dietari. Apunts del natural
2016
En el número 52 de la revista L'Espill trobaràs un dossier monogràfic sobre "Cultura, art i política", amb contribucions de Manuel Guerrero, Ignacio París i Manuel Borja-Villel. A més, articles de Francesc Serés, Gaspar Jaén i Marco Lucchini, Carlos Thiebaut, Julián Marrades, Carme Castells, Carles Cabrera, Vicenç M. Rosselló i Verger, Tomàs Escuder, Joan Fontcuberta i Elio Grazioli, així com documents d'Agustín Rubio Vela, un full de dietari de Gustau Muñoz i una conversa amb Josep Fontana, per Francesc Viadel.
Fulls de dietari. Pedra rasposa
2016
En el número 53 de la revista L'Espill trobaràs contribucions d'Achille Mbembe, Scott Sherman, Manuel Alcaraz, Josep J. Conill, Àlex Matas Pons, Marta Darocha Mora, Joaquim Espinós, Pau Guinart, Simona Škrabec, Goran Simić, Manuel Guerrero, Xavier Arenós i Josep Puigsech Farràs, així com documents de Benjamin Constant, un full de dietari de Rafa Gomar i una conversa amb Josep Ramoneda, per Faust Ripoll.