In vivo assessment of the anterior scleral contour assisted by automatic profilometry and changes in conjunctival shape after miniscleral contact lens fitting
ConclusionsESP shows mild differences in scleral shape between eyes with regular and irregular corneas. ESP might be valuable in quantifying the mechanical impact of the ScCL on the anterior eye surface.ResumenObjetivoComparar la forma de la esclerótica anterior de los candidatos a utilizar lentes de apoyo escleral (ScCL) con córneas regulares e irregulares, y analizar los cambios inducidos en la forma de la superfÃcie esclero-conjuntival tras el uso de dichas lentes.MétodosSe incluyeron consecutivamente treinta y cinco ojos de 18 sujetos (19 ojos con córneas irregulares y 16 con córneas regulares). Se realizaron tre...
Source: Journal of Optometry - November 3, 2018 Category: Opthalmology Source Type: research
Characterization of optical performance with defocusing curve: Analysis of two refractive intraocular lens models with high and medium addition
ConclusionsThe high addition intraocular lens provides better visual acuity in the spatial range from infinity to the point close to 25 cm. The medium addition intraocular lens provides excellent visual acuity in far and intermediate vision.The defocus curve seems to be a valid and reproducible tool for evaluating the optical behavior of multifocal sector refractive lenses.ResumenObjetivoCaracterizar el comportamiento óptico de dos modelos de lentes intraoculares bifocales refractivas, con adición media y alta, utilizando curvas de desenfoque.MétodosSe incluyó en este estudio a 20 ojos de 20 sujetos: 10 ojos somet...
Source: Journal of Optometry - November 2, 2018 Category: Opthalmology Source Type: research
Clinical evaluation of an automated subjective refraction method implemented in a computer-controlled motorized phoropter
ConclusionsThe proposed automated method is repeatable and more accurate than objective techniques in healthy adults. However, it is not accurate enough to replace the clinical subjective refraction yet and it should be tested in a wider population in terms of age, refraction and different ocular conditions. Despite these important limitations, this method has been shown to be a potentially valuable method to improve the access to primary eye care services in developing countries.ResumenObjetivoInvestigar un nuevo algoritmo para llevar a cabo una refracción automatizada no ciclopéjica en adultos.MétodosSe midió a cincu...
Source: Journal of Optometry - October 31, 2018 Category: Opthalmology Source Type: research
Retinal glial changes in Alzheimer's disease – A review
The objective of this review is to compile the most relevant findings in the last 10 years relating to alterations in the eye in AD, and the role that glial cells play in the degenerative process in the retina in the context of neurodegeneration.ResumenLa enfermedad de Alzheimer (EA) es una demencia neurodegenerativa que se caracteriza por la deposición de placas beta-amiloides (βA) extracelulares, y la presencia de ovillos neurofibrilares. Hasta ahora, las técnicas utilizadas para analizar estos depósitos han sido poco accesibles, invasivas y costosas. Esto nos lleva a considerar nuevas vÃas de acceso al sistema nerv...
Source: Journal of Optometry - October 29, 2018 Category: Opthalmology Source Type: research
Comparison of macular retinal sensitivity and its contribution to the foveal sensitivity between diabetic and non-diabetic patients with normal visual acuity
ConclusionsSubjects without diabetes have a significantly higher sensitivity in the temporal retina compared with those with diabetes; points with highest mean retinal sensitivity do not correspond to the central four. The reduced sensitivity in point 1 decreases the mean foveal sensitivity in subjects with diabetes, because this variable correlates with lower perimetry points.ResumenObjetivoComparar la sensibilidad de la retina y evaluar su contribución a la sensibilidad de la fóvea en pacientes con y sin diabetes con agudeza visual normal.MétodosEstudio observacional, descriptivo, transversal y prospectivo en 20 sujet...
Source: Journal of Optometry - October 29, 2018 Category: Opthalmology Source Type: research
An Eyelid Warming Device for the Management of Meibomian Gland Dysfunction
ConclusionsThe EyeBag may relieve symptoms of dry eye, but the effect on meibomian gland function and tear stability when used for only 4 weeks was undetectable.ResumenObjetivoDeterminar la efectividad de MGDRx EyeBag en el tratamiento de la disfunción de las glándulas de Meibomio.MétodosEstudio prospectivo, aleatorizado, controlado, simple ciego (investigador), bilateral, que incluyó a 29 participantes aleatorizados entre el grupo EyeBag o el grupo control. El grupo EyeBag utilizó dicho dispositivo 2 veces/dÃa durante 10 minutos, y el grupo control siguió su propio tratamiento para ojo seco (de haberlo). Se observÃ...
Source: Journal of Optometry - October 17, 2018 Category: Opthalmology Source Type: research
Pharmacology without drugs
Publication date: Available online 1 August 2018Source: Journal of OptometryAuthor(s): Jesús Pintor (Source: Journal of Optometry)
Source: Journal of Optometry - August 1, 2018 Category: Opthalmology Source Type: research
High-speed recording of thermal load during laser trans-epithelial corneal refractive surgery using a 750 Hz ablation system
ConclusionThe ITEC software is effective in controlling the maximum temperature rise during laser ablation in the extremely challenging situation of trans-PRK involving high ablation volumes of almost 6000 nl, potentially improving the outcomes. The ITEC system limited the maximum temperature to 39.7 °C in the epithelium, and 37.7 °C in the stroma. The epithelial temperature was always higher than stromal temperature (regardless of high or low fluence irradiation). Safety limit of 40 °C found in the literature was never reached.ResumenObjetivoEvaluar el aumento de temperatura de la córnea humana dur...
Source: Journal of Optometry - July 21, 2018 Category: Opthalmology Source Type: research
Customary practices in the monitoring of dry eye disease in Sjogren's syndrome
ConclusionsThe monitoring of DED in SS is not uniform in optometric offices across North America. Creating accepted standards of testing will improve the ability of clinicians and researchers to communicate and understand the course of DED in SS.ResumenObjetivoLas pruebas diagnósticas para la enfermedad del ojo seco en el sÃndrome de Sjogren (SS) están bien descritas. Se ha publicado poco acerca de la supervisión de este sÃndrome del ojo seco autoinmune sistémico. Analizamos el SS relacionado con las pruebas de ojo seco en las prácticas optométricas de Norte América, y comparamos los centros académicos con los ce...
Source: Journal of Optometry - July 17, 2018 Category: Opthalmology Source Type: research
The eyelash follicle features and anomalies: A review
Publication date: Available online 17 July 2018Source: Journal of OptometryAuthor(s): Sarah Aumond, Etty BittonAbstractThe primary role of eyelashes is to protect and maintain the health of the lid margin. However, the mechanisms to fulfill this role are not fully understood. Unraveling these mechanisms will stand to greatly improve the efficiency of eye care professionals’ interventions in anomalies of the eyelashes. The aim of this article is to provide a review on eyelashes including highlights and new avenues for research; the biology of both the lash and its follicle; the pathophysiology and management of lash anoma...
Source: Journal of Optometry - July 17, 2018 Category: Opthalmology Source Type: research
Tear instability importance, mechanisms, validity and reliability of assessment
ConclusionsFluorescein tear break up time assessments cannot be standardised and less-invasive methods are not yet standardised. Objective less-invasive and subjective fluorescein break up time tests do not appear to be measuring the same tear phenomena although both should be performed before other invasive procedures.ResumenObjetivoExaminar los factores que contribuyen a la estabilidad de la lágrima y a la validez y fiabilidad de los métodos utilizados para evaluar el tiempo de ruptura lagrimal, que forma parte esencial del examen de la estabilidad de la lágrima en los pacientes con ojo seco.MétodosRevisión y evalua...
Source: Journal of Optometry - July 10, 2018 Category: Opthalmology Source Type: research
Symmetry of peripheral retinal nonperfusion in diabetic retinopathy by ischemic index
ConclusionAsymmetrical retinopathy in diabetic patients is uncommon and additional pathological processes should be considered in the presence of asymmetric DR.ResumenObjetivoLa retinopatÃa diabética constituye la causa principal de ceguera entre los adultos en edad productiva en muchos paÃses desarrollados. Afecta a los ojos bilateralmente, y por lo general se piensa que es simétrica, aunque existen pocos estudios que evalúen la simetrÃa en esta situación. El objetivo del presente estudio fue evaluar la simetrÃa de la cantidad de isquemia en la retina periférica en pacientes con retinopatÃa diabética.MétodosSe...
Source: Journal of Optometry - July 10, 2018 Category: Opthalmology Source Type: research
Validation of refraction and anterior segment parameters by a new multi-diagnostic platform (VX120)
ConclusionsThe VX120 provides consistent refraction and most anterior segment measurements in normal healthy eyes, with high levels of intra and inter-session repeatability.ResumenAntecedentesVX120 (Visionix Luneau, Francia) es una plataforma multi-diagnóstico novedosa que combina la auto-refracción basada en Hartmann–Shack, la topografÃa corneal mediante discos de Plácido, y las mediciones del segmento anterior realizadas mediante cámara de Scheimpflug. Analizamos la concordancia entre los diferentes parámetros medidos por VX120 con las técnicas aceptadas o de referencia, para probar si eran intercambiables, y ev...
Source: Journal of Optometry - July 10, 2018 Category: Opthalmology Source Type: research
Comparison of contrast sensitivity in β-thalassemia patients treated by deferoxamine or deferasirox
ConclusionsCS tests can detect visual disturbance in thalassemic patients before the impairment of visual acuity. It is suggested that CS tests be included in their regular eye examination.ResumenObjetivoComparar la sensibilidad de contraste (SC) en pacientes multitrasfundidos con β-talasemia y tratados con deferoxamina u Osveral.MétodosEn este estudio transversal, un total de 60 pacientes con β-talasemia (30 tratados con deferoxamina y 30 con deferasirox) fueron considerados como grupo de estudio, y 30 sujetos sanos pareados por edad y sexo fueron seleccionados como grupo control. A todos los sujetos se les realizó un...
Source: Journal of Optometry - July 10, 2018 Category: Opthalmology Source Type: research
Refractive error magnitude and variability: Relation to age
ConclusionsMean ocular refraction and refractive error distribution vary with age. The highest magnitude of myopia is found in young adults. Similar to prevalence, the severity of myopia also appears to have increased since 1931.ResumenObjetivoEstudiar la refracción ocular media (MOR) y el astigmatismo a lo largo del rango de la vida humana, y comparar la magnitud del error refractivo con estudios previos sobre poblaciones clÃnicas con rangos de edad amplios.MétodosPara este estudio descriptivo, se extrajeron de la base de datos Waterloo Eye Study (WatES) la edad del paciente, el error refractivo y el historial de cirug...
Source: Journal of Optometry - July 10, 2018 Category: Opthalmology Source Type: research
