Immediate effect of a tear enhancer and meibomian gland expression on the corneal surface and whole eye higher order aberrations
ConclusionThere were no detectable differences between right and left eyes. For the 6 mm pupil, the tear enhancer tended to improve optical performance of the WE and meibomian gland expression tended to reduce the optical performance at the CS.ResumenObjetivoEstudiar los cambios de las aberraciones oculares de alto orden (HOA) inducidas por la aplicación de las lágrimas artificiales con 0,15% de hialuronato sódico y la expresión de las glándulas de Meibomio (ME) en la película lagrimal en sujetos normales.MétodosSe obtuvieron los valores de HOA de la superficie corneal (SC) y de la totalidad del ojo, utilizando...
Source: Journal of Optometry - July 5, 2018 Category: Opthalmology Source Type: research
Accommodative insufficiency in a student population in Iran
ConclusionThe prevalence of AI in the present study is lower than the most prevalence rates reported in previous studies. In the present study, gender and AI showed a strong association, such that AI prevalence was significantly higher in females than males.ResumenObjetivoDeterminar la prevalencia de la insuficiencia acomodativa (IA) y su relación con la edad, sexo, y errores refractivos en una población universitaria de Irán.MétodosEl presente estudio se realizó de forma transversal en 2017. Se realizaron pruebas optométricas a todos los estudiantes, incluyendo medición de la agudeza visual, refracción objetiva y ...
Source: Journal of Optometry - July 5, 2018 Category: Opthalmology Source Type: research
HbA1c and retinal sensitivity in diabetics using microperimetry
ConclusionRetinal sensitivity at the central 10° of the macula is affected by changes in HbA1c values.ResumenObjetivoEl objetivo de este estudio fue determinar la relación entre los valores de HbA1c y la sensibilidad de la retina en los 10 grados centrales de la misma utilizando el microperímetro MP-1.MétodosSe realizó un estudio prospectivo en 32 sujetos sanos (grupo control) y 60 pacientes diabéticos. Los pacientes diabéticos se dividieron en dos grupos: el grupo 1 se compuso de 30 pacientes sin retinopatía diabética (RD), y el grupo 2 incluyó a 30 pacientes con RD no proliferativa leve. Se realizó una micrope...
Source: Journal of Optometry - July 5, 2018 Category: Opthalmology Source Type: research
Normative values for clinical measures used to classify accommodative and vergence anomalies in a sample of high school children in South Africa
ConclusionThis study provides norms for clinical measures which could be used to classify accommodative and vergence parameters for children aged 13–18 years in this population or beyond. Findings should be applied in the context of the measurement techniques and the associated limitations outlined in this report.ResumenObjetivoDeterminar los valores normativos para la estereoagudeza, y las mediciones de acomodación y vergencia para poblaciones de estudiantes de secundaria.MétodosUtilizando un muestreo de grupo aleatorio de etapas múltiples, se seleccionaron 1.211 chicos (481 varones y 730 mujeres) de edades comprendi...
Source: Journal of Optometry - July 5, 2018 Category: Opthalmology Source Type: research
Accuracy of Cirrus HD-OCT and Topcon SP-3000P for measuring central corneal thickness
ConclusionOCT and UPS offered highly comparable results, whereas NCSM offered lower mean CCT values compared to the other two methods. Therefore, NCSM should not be considered a reliable method for measuring CCT and should rather be considered for assessing longitudinal changes in the same patient.ResumenObjetivoComparar y analizar la intercambiabilidad de tres sistemas de medición, basado cada uno de ellos en una técnica diferente, para estudiar el espesor corneal central (ECC).MétodosSe realizaron mediciones del ECC utilizando tomografía de coherencia óptica (OCT), microscopía especular (NCSM), y paquimetría ultra...
Source: Journal of Optometry - July 5, 2018 Category: Opthalmology Source Type: research
Milestones in the development of Spanish optometry
Publication date: July–September 2018Source: Journal of Optometry, Volume 11, Issue 3Author(s): César Villa-Collar (Source: Journal of Optometry)
Source: Journal of Optometry - July 5, 2018 Category: Opthalmology Source Type: research
Comparison of cyclopentolate versus tropicamide cycloplegia: A systematic review and meta-analysis
ConclusionWe suggest that tropicamide may be considered as a viable substitute for cyclopentolate due to its rapid onset of action. Although these results should be used cautiously in infants and in patients with high hyperopia or strabismus when using tropicamide as the sole cycloplegic agent especially in situations that the findings are variable or there is no consistency between the examination results and clinical manifestations of the visual problems.ResumenObjetivoEl objetivo del presente meta-análisis es comparar la eficacia de ciclopentolato y tropicamida a la hora de controlar la acomodación durante la refracci...
Source: Journal of Optometry - July 5, 2018 Category: Opthalmology Source Type: research
The effect of spherical aberration on visual performance and refractive state for stimuli and tasks typical of night viewing
ConclusionOcular SA can be a significant contributor to changes in refractive state when viewing high-contrast point sources typically encountered in nighttime environments.ResumenObjetivoEl objetivo de este estudio fue examinar el impacto de la aberración esférica de Seidel (AS) sobre el estado refractivo óptimo para detectar y discriminar las luces brillantes de pequeño tamaño sobre un fondo oscuro.MétodosSe utilizó un sistema de óptica adaptativa para corregir las aberraciones oculares de ojos bajo cicloplegía, e introducir sistemáticamente cinco valores de AS para una pupila de 7 mm de diámetro: 0, ...
Source: Journal of Optometry - July 5, 2018 Category: Opthalmology Source Type: research
Measuring the heterophoria: Agreement between two methods in non-presbyopic and presbyopic patients
ConclusionCover test and von Graefe methods have a high level of agreement for both distance and near vision when considering presbyopic subjects. For non-presbyopic patients, the level of agreement is very low. Both methods for measuring heterophoria can only be considered interchangeable for presbyopic patients. For clinical purposes, this implies that any method can be used for measuring heterophoria in presbyopic patients.ResumenObjetivoEstablecer si el “cover test” y el método de von Graefe son intercambiables en la población sin y con presbicia.MétodosRealizamos un estudio prospectivo en una muestra de 127 suj...
Source: Journal of Optometry - July 5, 2018 Category: Opthalmology Source Type: research
Visual and binocular status in elementary school children with a reading problem
ConclusionFindings indicate that some children with an identified reading problem also present with abnormal binocular test results compared to published normal values. Further investigation should be performed to investigate the relationship between binocular vision function and reading performance.ResumenObjetivoEste estudio descriptivo aporta un resumen de las anomalías binoculares observadas en niños de primaria en los que se identificaron problemas de lectura.MétodosRevisión retrospectiva de las historias clínicas de todos los niños en los que se identificaron problemas de lectura, examinados en la Universidad d...
Source: Journal of Optometry - July 5, 2018 Category: Opthalmology Source Type: research
The significance of changes in pupil size during straylight measurement and with varying environmental illuminance
ConclusionWe conclude that the illuminance of the examination room during straylight assessment does not affect the outcome in normal eyes. In fact, under mesopic and scotopic conditions, the luminance of the test field is so much higher than that of the room so that it determines the pupil size. Regardless of the lighting level, straylight measured in a laboratory, is valid for photopic pupils at an adaptation level corresponding with about 400 lux room illuminance.ResumenObjetivoEn este trabajo investigamos las condiciones de la pupila durante la medición de la dispersión lumínica, así como el efecto potencial que el...
Source: Journal of Optometry - July 5, 2018 Category: Opthalmology Source Type: research
Visual outcome of penetrating keratoplasty, deep anterior lamellar keratoplasty and Descemet membrane endothelial keratoplasty
ConclusionOverall, DMEK proved superior over PK and DALK in terms of quality of vision, with PK offering slightly better outcomes than DALK in most visual function parameters under evaluation.ResumenObjetivoSe diseñó un estudio en un único centro y transversal para evaluar y comparar la calidad de la visión subjetiva de los pacientes intervenidos de queratoplastia penetrante (QP), queratoplastia lamelar anterior profunda (QLAP) y queratoplastia endotelial de membrana de Descemet (DMEK).MétodosSe incluyó a cuarenta y seis pacientes previamente intervenidos de QP (22 ojos), QLAP (7 ojos) y DMEK (17 ojos). La evaluació...
Source: Journal of Optometry - July 5, 2018 Category: Opthalmology Source Type: research
Comparison of manual & automated analysis methods for corneal endothelial cell density measurements by specular microscopy
ConclusionOur findings show that automated analysis significantly overestimates ECD in the eyes with high polymegathism and/or large cell size, compared to the manual method. Therefore, we discourage reliance upon the fully-automated method alone to perform specular microscopy analysis, particularly if an accurate ECD value is imperative.ResumenObjetivoDeterminar la fiabilidad de la densidad celular endotelial corneal (ECD) obtenida mediante microscopio especular automático frente a métodos manuales validados y factores predictivos de la fiabilidad.MétodosSe capturaron imágenes nítidas de 94 controles y 106 ojos glauc...
Source: Journal of Optometry - July 5, 2018 Category: Opthalmology Source Type: research
Reply to: Central corneal thickness measurement with Cirrus HD-OCT and Topcon SP-3000P
Publication date: July–September 2018Source: Journal of Optometry, Volume 11, Issue 3Author(s): Jorge A. Calvo-Sanz (Source: Journal of Optometry)
Source: Journal of Optometry - July 5, 2018 Category: Opthalmology Source Type: research
Central corneal thickness measurement with Cirrus HD-OCT and Topcon SP-3000P
Publication date: July–September 2018Source: Journal of Optometry, Volume 11, Issue 3Author(s): Maddalena De Bernardo, Francesco Antonio Salzano, Nicola Rosa (Source: Journal of Optometry)
Source: Journal of Optometry - July 5, 2018 Category: Opthalmology Source Type: research
