Sources of error in clinical measurement of the amplitude of accommodation
Publication date: Available online 11 July 2019Source: Journal of OptometryAuthor(s): David H. Burns, Peter M. Allen, David F. Edgar, Bruce J.W. EvansAbstractMeasurement of the amplitude of accommodation is established as a procedure in a routine optometric eye examination. However, clinical methods of measurement of this basic optical function have several sources of error. They are numerous and diverse, and include depth of focus, reaction time, instrument design, specification of the measurement end-point, specification of the reference point of measurement, measurement conditions, consideration of refractive error, and...
Source: Journal of Optometry - July 12, 2019 Category: Opthalmology Source Type: research
Agreement between Pentacam and handheld Auto-Refractor/Keratometer for keratometry measurement
ConclusionOur study showed relatively wide limits of agreement between handheld NIDEK ARK-30 and Pentacam; therefore, these devices cannot be used interchangeably for measuring corneal curvature.ResumenObjetivoSe realizó este estudio para evaluar el nivel de concordancia de las mediciones queratométricas obtenidas mediante un sistema de cámara rotatoria Scheimpflug (Pentacam) y un auto-refractoqueratómetro portátil (NIDEK ARK-30 portátil).MétodoEste estudio analítico transversal fue realizado en los ojos derechos de 579 sujetos. Las mediciones queratométricas se obtuvieron con Pentacam y NIDEK ARK-30 portátil. Se...
Source: Journal of Optometry - July 10, 2019 Category: Opthalmology Source Type: research
Suso Pintor (1964-2019): The art of making science look easy
Publication date: July–September 2019Source: Journal of Optometry, Volume 12, Issue 3Author(s): Gonzalo Carracedo, Assumpta Peral (Source: Journal of Optometry)
Source: Journal of Optometry - July 1, 2019 Category: Opthalmology Source Type: research
Correlation between type 2 diabetes, dry eye and Meibomian glands dysfunction
ConclusionsMGD in type 2 diabetic patients is more severe compared with nondiabetic patients. Longer duration of diabetes is associated with major symptoms and changes in MG. Diabetic group showed major changes in lids and tear function, accounting for evaporative dry eye and presenting a high degree of correlation with MG inflammation and obstruction.ResumenObjetivoEvaluar las glándulas de Meibomio, la superficie ocular y la función de la lágrima en pacientes con diabetes tipo 2, y estudiar la correlación entre estas situaciones.MétodosEstudio prospectivo de 76 varones, 37 de ellos con diabetes tipo 2, con una media ...
Source: Journal of Optometry - May 25, 2019 Category: Opthalmology Source Type: research
Corneo-pterygium total area measurements utilising image analysis method
ConclusionsImage analysis method is useful, reliable and practical in the clinical setting to objectively quantify actual pterygium size, shapes and its effects on the anterior corneal curvature.ResumenObjetivoDescribir un método objetivo para cuantificar con precisión el área total corneal invadida por pterigium (CPTA) utilizando un método de análisis de imagen evaluando su asociación con el astigmatismo de la córnea (AC).MétodosSe seleccionaron 120 participantes con pterigium primario de entre los pacientes que acudieron a la clínica oftalmológica. Utilizamos un software de análisis de imagen para calcular el ...
Source: Journal of Optometry - May 14, 2019 Category: Opthalmology Source Type: research
Differential visual acuity – A new approach to measuring visual acuity
ConclusionFrom this proof of concept study we conclude that differential acuity gives similar results to the ETDRS chart in adults. We infer that the comparable but cognitively simpler differential visual acuity task could be applied in clinical settings for young children or patients with developmental delay who cannot respond by naming or matching.ResumenAntecedentesUn nuevo tipo de medición de la agudeza, al que denominaremos ‘agudeza diferencial, requiere que el observador identifique un único objetivo entre tres otros objetivos idénticos. Se trata de una prueba de estudio de concepto, que trata de determinar si l...
Source: Journal of Optometry - May 10, 2019 Category: Opthalmology Source Type: research
Normative values of visual evoked potentials in Northeastern of Iran
ConclusionAccording to the results of this study, VEPs components are affected by the stimulus size, monocular and binocular recording conditions and gender. Therefore, it is necessary to determine the normative values of VEPs in each population, so that the results could be used in clinical studies.ResumenObjetivoLos potenciales evocados visuales (PEV) aportan información diagnóstica importante relacionada con la integridad funcional de las vías visuales. El objetivo de este estudio fue establecer los valores normativos de los diferentes componentes de la reversión del patrón de PEV en adultos normales iraníes.Méto...
Source: Journal of Optometry - April 24, 2019 Category: Opthalmology Source Type: research
Uncontrolled experimentation is not an option for open minds: Ethical research is the answer
Publication date: April–June 2019Source: Journal of Optometry, Volume 12, Issue 2Author(s): David P Piñero (Source: Journal of Optometry)
Source: Journal of Optometry - April 5, 2019 Category: Opthalmology Source Type: research
Presbyopic correction use and its impact on quality of vision symptoms
ConclusionMajority of tasks are in the distance and these had a higher QoV than intermediate tasks with near focused tasks being even worse. It is important to discuss with patients the principal distance of the tasks they generally perform and the forms of presbyopic correction used from the outset.ResumenObjetivoEvaluar la adopción en el mundo real de la corrección de la presbicia y su impacto sobre la calidad de visión.MétodoSe supervisó el uso de correcciones de la visión por parte de 529 pacientes secuenciales (edad de 36 a 85 años, 50,4% mujeres) que acudieron a cuatro consultas optométricas en diferentes zon...
Source: Journal of Optometry - March 31, 2019 Category: Opthalmology Source Type: research
Effect of age on visual and refractive results after laser-assisted subepithelial keratomileusis (LASEK) with adjuvant use of mitomycin C
ConclusionsA tendency toward undercorrection and less predictability was found with aging after myopic LASEK with MMC for the correction of myopia.ResumenObjetivoEvaluar la influencia de la edad sobre los resultados visuales y refractivos tras queratomileusis subepitelial asistida por láser (LASEK) con uso adyuvante de mitomicina C (MMC) para la corrección de la miopía.MétodosEstudio de cohorte retrospectivo y no aleatorizado. Se incluyó en el estudio a un total de 1.374 ojos tratados con LASEK + MMC (comparamos 1.163 ojos de pacientes de edades comprendidas entre 18 y 40 años, con 211 ojos de pacientes may...
Source: Journal of Optometry - March 19, 2019 Category: Opthalmology Source Type: research
Keratometry in children: Comparison between auto-refractokeratometer, rotating scheimpflug imaging, and biograph
ConclusionsKeratometry measurement with Nidek ARK-510A was not significantly different from Pentacam and Lenstar, and this device can be used in screening programs in emmetropes.ResumenObjetivoDeterminar la concordancia y validez de las mediciones queratométricas en niños con el autorefractoqueratómetro Nidek ARK-510A, comparadas con las imágenes de Scheimpflug con Pentacam y el biómetro Lenstar LS 900.MétodosEste estudio se realizó en 5.620 niños, de edades comprendidas entre 6 y 12 años, en Shahroud, Irán. Se compararon los valores queratométricos mínimo y máximo y la magnitud del astigmatismo corneal median...
Source: Journal of Optometry - March 16, 2019 Category: Opthalmology Source Type: research
Peripheral refraction and spherical aberration profiles with single vision, bifocal and multifocal soft contact lenses
ConclusionWhen worn on eye, different commercially available lens types produce differences in the direction and magnitude of the peripheral refraction and spherical aberration profiles along different visual field meridians. This information may be relevant to refractive development and myopia control.ResumenObjetivoComparar los perfiles de refracción periférica y aberración esférica en tres meridianos del campo visual de 16 lentes de contacto (LC) comerciales de prueba monofocales (VS), bifocales (BF) y multifocales (MF), con control de visión simple.MétodoColocamos aleatoria y contralateralmente a cuarenta partici...
Source: Journal of Optometry - February 14, 2019 Category: Opthalmology Source Type: research
Long term outcomes of strabismus surgery for third nerve palsy
ConclusionsEsthetic and functional results were similar. No predictors of successful outcome were identified. HD was better 1 year after surgery, and VD improved during follow-up.ResumenObjetivoReportar los resultados a largo plazo de la cirugía de estrabismo para tratar la parálisis del III par.MétodosRealizamos un estudio retrospectivo a 15 años, de pacientes sometidos a cirugía. Analizamos la desviación media preoperatoria (a 6 meses, 1 año tras la cirugía, y al final del seguimiento), el tipo de cirugía, y los factores predictivos de los resultados. Se consideró un buen resultado estético una desviación fin...
Source: Journal of Optometry - January 5, 2019 Category: Opthalmology Source Type: research
Optometry: a discipline and profession that feeds from and empowers other specialties
Publication date: January–March 2019Source: Journal of Optometry, Volume 12, Issue 1Author(s): José Manuel González-Méijome (Source: Journal of Optometry)
Source: Journal of Optometry - December 25, 2018 Category: Opthalmology Source Type: research
How frequently should asymptomatic patients be dilated? 20-year results
Publication date: Available online 2 November 2018Source: Journal of OptometryAuthor(s): Paul Varner (Source: Journal of Optometry)
Source: Journal of Optometry - November 3, 2018 Category: Opthalmology Source Type: research
