Accommodation and age-dependent eye model based on in vivo measurements
ConclusionsThe proposed eye model is able to predict changes in objective refraction and accommodation response. It has the potential to be a useful design and testing tool for devices (e.g. intraocular lenses or contact lenses) designed to correct the eye's optical errors.ResumenObjetivoDesarrollar un modelo flexible de ojo medio que incorpore los cambios en función de la edad y la acomodación en todos los parámetros ópticos, incluyendo el diámetro de pupila de entrada, en condiciones ambientales fotópicas y naturales.MétodosRecopilamos medidas retrospectivas in vivo de todos los parámetros ópticos, incluyendo el...
Source: Journal of Optometry - July 10, 2018 Category: Opthalmology Source Type: research
Is 25 Hz enough to accurately measure a dynamic change in the ocular accommodation?
ConclusionContrary to the previous findings, a dynamic accommodative response exhibited frequencies larger than 10 Hz. Stimulus direction and amplitude had no influence on the frequencies present in the dynamic response. Peak velocity and acceleration can be significantly underestimated when sampled at a lower rate. Taken as a whole, low sampling rate instruments can accurately estimate static accommodation, however, caution needs to be exercised when using them for dynamic accommodation.ResumenLa acomodación se registra a menudo a una tasa de muestreo baja, utilizando dispositivos tales como los autorrefractómetros...
Source: Journal of Optometry - July 10, 2018 Category: Opthalmology Source Type: research
Effect of phenylephrine on static and dynamic accommodation
ConclusionsThe mydriatic effect of the PHCl causes optical changes in the eye that can reduce the objective and subjective measurement of accommodation.ResumenObjetivoProbamos la hipótesis de que los cambios de la acomodación tras la instilación de Hidrocloruro de Fenilefrina (PHCl) observados en algunos estudios podrían estar originados por los cambios en la óptica.MétodosRealizamos dos experimentos para probar los efectos de PHCl sobre la acomodación estática y dinámica en 8 y 6 sujetos, respectivamente. Se registraron las mediciones objetivas de frente de onda de la respuesta acomodativa estática a un estímul...
Source: Journal of Optometry - July 10, 2018 Category: Opthalmology Source Type: research
Prevalence of esophoria in concussed patients
DiscussionNear esophoria was found in nearly one-third of this practice-based sample of concussed patients. Thus, it was more common than typically believed to be the case. Two proposed oculomotor-based mechanisms related to these symptomatic esophoric patients included phoria decompensation and excessive accommodative vergence.ResumenObjetivoEvaluar la prevalencia de la endoforia de cerca en pacientes con conmoción, en un centro privado de neuro-optometría.MétodosSe realizó un análisis retrospectivo, en un centro privado de neuro-optometría, con revisión de las historias de pacientes consecutivos con diagnóstico m...
Source: Journal of Optometry - July 10, 2018 Category: Opthalmology Source Type: research
Publication bias and the chase for statistical significance
Publication date: April–June 2018Source: Journal of Optometry, Volume 11, Issue 2Author(s): Iván Marín-Franch (Source: Journal of Optometry)
Source: Journal of Optometry - July 10, 2018 Category: Opthalmology Source Type: research
Beta2 adrenergic receptor silencing change intraocular pressure in New Zealand rabbits
ConclusionThe use of siRNA against the beta2 adrenergic receptors could provide an interesting therapeutic strategy for glaucoma treatment.ResumenObjetivoEl glaucoma consiste en un grupo de neuropatías ópticas progresivas caracterizadas por degeneración del nervio óptico y pérdida irreversible del campo visual. La elevación de la presión intraocular es el único factor de riesgo tratable probado, centrándose los productos comerciales para el tratamiento del glaucoma en la reducción de la presión intraocular. Estos fármacos pueden tener diversos efectos secundarios indeseados, lo cual invita a buscar nuevas estra...
Source: Journal of Optometry - July 10, 2018 Category: Opthalmology Source Type: research
More sensitive correlation of afferent pupillary defect with ganglion cell complex
ConclusionsSignificant correlations between RNFLT loss for cpRNFLT, pcpRNFLT and GCC parameters with RAPD were observed. Approximately a 35% higher sensitivity was obtained using GCC compared to CRNFL parameters. The expected change in GCC average for every 0.3 log unit increment was approximately 8.49 μm. The FLV% corresponded more sensitively to a RAPD but appeared to be influenced by disease severity.ResumenObjetivoEste estudio investigó la correlación entre el defecto pupilar aferente relativo (DPAR) y el grosor de la capa de fibras nerviosas de la retina (RNFLT) en la neuropatía óptica.MétodosLa valora...
Source: Journal of Optometry - July 10, 2018 Category: Opthalmology Source Type: research
Orbital magnetic resonance imaging is useful in age-related distance esotropia
ConclusionsMRI showed that displacements of LR and LR–SR band degeneration could facilitate the diagnosis of patients with ARDE.ResumenObjetivoDescribir los hallazgos encontrados en la resonancia magnética orbitaria (RMN) en pacientes con esotropía asociada a la edad (ETAE).MétodosComparamos 31 RMN orbitarias de pacientes con ETAE (77 ± 7 DE años) con 2 grupos control: 32 órbitas de individuos con edades comprendidas entre 18 y 50 años (33 ± 8 DE años) y 16 órbitas de individuos con edades>60 años (77 ± 7 DE años). Las RMN se adquirieron utilizando eco de campo rápido 3D en sec...
Source: Journal of Optometry - July 10, 2018 Category: Opthalmology Source Type: research
Influence of refractive error on pupillary dynamics in the normal and mild traumatic brain injury (mTBI) populations
ConclusionsOver a range of dynamic and static pupillary parameters, the PLR was influenced by refractive error in both populations. In cases of high refractive error, the PLR parameters may need to be compensated for this factor for proper categorization and diagnosis.ResumenObjetivoExisten diversos estudios que han investigado el diámetro pupilar estático y basal en individuos con visión normal en todo el espectro de errores refractivos. Sin embargo, ninguno de ellos ha evaluado el reflejo dinámico pupilar a la luz (RPL). En el presente estudio, se evaluaron tanto los parámetros pupilares estáticos como los dinámic...
Source: Journal of Optometry - July 10, 2018 Category: Opthalmology Source Type: research
Assessment of neuro-optometric rehabilitation using the Developmental Eye Movement (DEM) test in adults with acquired brain injury
DiscussionThe results of the present study demonstrated considerable improvements in the DEM test scores following the oculomotor-based training, thus reflecting more time-optimal and accurate saccadic tracking after the training. The DEM test should be considered as another clinical test of global saccadic tracking performance in the ABI population.ResumenObjetivoEste estudio piloto trató de determinar la eficacia del uso de la prueba DEM (Developmental Eye Movement) en la población adulta con daño cerebral adquirido (DCA) para cuantificar clínicamente los efectos de la rehabilitación/terapia visual controlada, reali...
Source: Journal of Optometry - July 10, 2018 Category: Opthalmology Source Type: research
Agreement between total corneal astigmatism calculated by vector summation and total corneal astigmatism measured by ray tracing using Galilei double Scheimpflug analyzer
ConclusionThe magnitudes and axes of astigmatisms measured by the vector summation and ray tracing methods cannot be used interchangeably. There was a systematic error between the TCAVec and TCARay magnitudes.ResumenObjetivoEvaluar la concordancia entre el astigmatismo corneal total calculado mediante suma de los vectores del astigmatismo corneal anterior y posterior (TCAVec), y el astigmatismo corneal total medido mediante trazado de rayos (TCARay).MétodosEste estudio incluyó a un total de 204 ojos derechos de 204 sujetos normales. Los ojos se midieron utilizando un analizador Galilei de doble cámara Scheimpflug. Los p...
Source: Journal of Optometry - July 10, 2018 Category: Opthalmology Source Type: research
Visual outcomes and management after corneal refractive surgery: A review
Publication date: April–June 2018Source: Journal of Optometry, Volume 11, Issue 2Author(s): Ane Murueta-Goyena, Pilar CañadasAbstractCorneal refractive surgery procedures are widely performed to permanently correct refractive errors. Overall, refractive surgeries are safe, predictable and present high rates of satisfaction. Nevertheless, the induced epithelial, stromal and nerve damage alters corneal integrity and function, triggering a regenerative response. Complications that arise from corneal wound healing process might directly impact on visual outcomes of keratorefractive procedures. Most of these complications ca...
Source: Journal of Optometry - July 10, 2018 Category: Opthalmology Source Type: research
Evaluation of Goldmann applanation tonometry, rebound tonometry and dynamic contour tonometry in keratoconus
Publication date: April–June 2018Source: Journal of Optometry, Volume 11, Issue 2Author(s): Maddalena De Bernardo, Nicola Rosa (Source: Journal of Optometry)
Source: Journal of Optometry - July 10, 2018 Category: Opthalmology Source Type: research
Reply to comment by De Bernardo and Rosa on “Evaluation of Goldmann applanation tonometry, rebound tonometry and dynamic contour tonometry in keratoconus”
Publication date: April–June 2018Source: Journal of Optometry, Volume 11, Issue 2Author(s): Fatih Özcura, Nilgün Yıldırım (Source: Journal of Optometry)
Source: Journal of Optometry - July 10, 2018 Category: Opthalmology Source Type: research
Avoiding misinterpretations of Kappa angle for clinical research studies with Pentacam
Publication date: Available online 4 April 2018Source: Journal of OptometryAuthor(s): Manuel Rodríguez-Vallejo, David P. Piñero, Joaquín Fernández (Source: Journal of Optometry)
Source: Journal of Optometry - July 10, 2018 Category: Opthalmology Source Type: research
