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https://www.readbyqxmd.com/read/29138533/comparison-of-visual-outcomes-after-bilateral-implantation-of-a-diffractive-trifocal-intraocular-lens-and-blended-implantation-of-an-extended-depth-of-focus-intraocular-lens-with-a-diffractive-bifocal-intraocular-lens
#1
André Lins de Medeiros, André Gustavo de Araújo Rolim, Antonio Francisco Pimenta Motta, Bruna Vieira Ventura, César Vilar, Mário Augusto Pereira Dias Chaves, Pedro Carlos Carricondo, Wilson Takashi Hida
Purpose: The purpose of this study was to compare the visual outcomes and subjective visual quality between bilateral implantation of a diffractive trifocal intraocular lens, Alcon Acrysof IQ(®) PanOptix(®) TNFT00 (group A), and blended implantation of an extended depth of focus lens, J&J Tecnis Symfony(®) ZXR00 with a diffractive bifocal intraocular lens, J&J Vision Tecnis(®) ZMB00 (group B). Methods: This prospective, nonrandomized, consecutive, comparative study included the assessment of 40 eyes in 20 patients implanted with multifocal intraocular lens...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/29114840/fixational-saccades-and-their-relation-to-fixation-instability-in-strabismic-monkeys
#2
COMPARATIVE STUDY
Suraj Upadhyaya, Mythri Pullela, Santoshi Ramachandran, Samuel Adade, Anand C Joshi, Vallabh E Das
Purpose: To evaluate the contribution of fixational saccades toward fixation instability in strabismic monkeys. Methods: Binocular eye movements were measured as six experimental monkeys (five strabismic monkeys and one monkey with downbeat nystagmus) and one normal monkey fixated targets of two shapes (Optotype, Disk) and two sizes (0.5°, 2°) during monocular and binocular viewing. Fixational saccades were detected using an unsupervised clustering algorithm. Results: When compared with the normal monkey, amplitude and frequency of fixational saccades in both the viewing and nonviewing eye were greater in 3 of 5 strabismic monkeys (1-way ANOVA on ranks P < 0...
November 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29114201/the-influence-of-auditory-information-on-visual-size-adaptation
#3
Alessia Tonelli, Luigi F Cuturi, Monica Gori
Size perception can be influenced by several visual cues, such as spatial (e.g., depth or vergence) and temporal contextual cues (e.g., adaptation to steady visual stimulation). Nevertheless, perception is generally multisensory and other sensory modalities, such as auditory, can contribute to the functional estimation of the size of objects. In this study, we investigate whether auditory stimuli at different sound pitches can influence visual size perception after visual adaptation. To this aim, we used an adaptation paradigm (Pooresmaeili et al...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29096178/association-between-fine-motor-skills-and-binocular-visual-function-in-children-with-reading-difficulties
#4
Ewa Niechwiej-Szwedo, Fatimah Alramis, Lisa W Christian
Performance of fine motor skills (FMS) assessed by a clinical test battery has been associated with reading achievement in school-age children. However, the nature of this association remains to be established. The aim of this study was to assess FMS in children with reading difficulties using two experimental tasks, and to determine if performance is associated with reduced binocular function. We hypothesized that in comparison to an age- and sex-matched control group, children identified with reading difficulties will perform worse only on a motor task that has been shown to rely on binocular input...
October 27, 2017: Human Movement Science
https://www.readbyqxmd.com/read/29082097/there-is-more-to-accommodation-of-the-eye-than-simply-minimizing-retinal-blur
#5
I Marín-Franch, A J Del Águila-Carrasco, P Bernal-Molina, J J Esteve-Taboada, N López-Gil, R Montés-Micó, P B Kruger
Eyes of children and young adults change their optical power to focus nearby objects at the retina. But does accommodation function by trial and error to minimize blur and maximize contrast as is generally accepted? Three experiments in monocular and monochromatic vision were performed under two conditions while aberrations were being corrected. In the first condition, feedback was available to the eye from both optical vergence and optical blur. In the second, feedback was only available from target blur. Accommodation was less precise for the second condition, suggesting that it is more than a trial-and-error function...
October 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/29075940/semiautomatic-procedure-to-assess-changes-in-the-eye-accommodative-system
#6
Aikaterini I Moulakaki, Daniel Monsálvez-Romín, Alberto Domínguez-Vicent, José J Esteve-Taboada, Robert Montés-Micó
PURPOSE: The aim of this pilot study was to evaluate a new semiautomatic procedure to assess in vivo changes in the crystalline lens and ciliary muscle during accommodation. METHODS: A total of 14 subjects were divided into two groups, young (aged between 20 and 25 years) and adult (aged between 35 and 40 years), and measured with an anterior segment optical coherence tomography. A semiautomatic procedure was implemented to measure the central lens thickness (CLT), anterior lens radius (ALR) and the ciliary muscle area (CMA) for the unaccommodated eye and for a vergence of - 3...
October 26, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/29062784/evaluation-of-the-iridocorneal-angle-with-accommodation-using-optical-coherence-tomography
#7
Daniel Monsálvez-Romín, Antonio Del Águila-Carrasco, Teresa Ferrer-Blasco, José J Esteve-Taboada, Robert Montés-Micó
The changes in the iridocorneal angle structure during accommodation are assessed by means of anterior segment optical coherence tomography. Thirteen right eyes were included in the study. The device used for the measurement was the Visante(®)omni system. The stimuli were set up at different vergences (0.0 D, -1.5 D, and -3.0 D). The angle opening distance 500 and 750, the trabecular iris space area 500 and 750, and the scleral spur angle parameters were assessed at the nasal and temporal regions. The results in the iridotrabecular angle comparing the three accommodative states of the eye did not yield any statistically significant difference at nasal or temporal angle sections...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/29051327/asymmetrical-accommodation-in-hyperopic-anisometropic-amblyopia
#8
Sonia Toor, Anna M Horwood, Patricia Riddell
BACKGROUND/AIMS: To investigate the presence of asymmetrical accommodation in hyperopic anisometropic amblyopia. METHODS: Accommodation in each eye and binocular vergence were measured simultaneously using a PlusoptiX SO4 photorefractor in 26 children aged 4-8 years with hyperopic anisometropic amblyopia and 13 controls (group age-matched) while they viewed a detailed target moving in depth. RESULTS: Without spectacles, only 5 (19%) anisometropes demonstrated symmetrical accommodation (within the 95% CI of the mean gain of the sound eye of the anisometropic group), whereas 21 (81%) demonstrated asymmetrical accommodation...
October 19, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/29051012/vergence-driven-accommodation-with-simulated-disparity-in-myopia-and-emmetropia
#9
Guido Maiello, Kristen L Kerber, Frank Thorn, Peter J Bex, Fuensanta A Vera-Diaz
The formation of focused and corresponding foveal images requires a close synergy between the accommodation and vergence systems. This linkage is usually decoupled in virtual reality systems and may be dysfunctional in people who are at risk of developing myopia. We study how refractive error affects vergence-accommodation interactions in stereoscopic displays. Vergence and accommodative responses were measured in 21 young healthy adults (n=9 myopes, 22-31 years) while subjects viewed naturalistic stimuli on a 3D display...
October 16, 2017: Experimental Eye Research
https://www.readbyqxmd.com/read/29041051/systematic-characterization-and-optimization-of-3d-light-field-displays
#10
Hekun Huang, Hong Hua
One of the key issues in conventional stereoscopic displays is the well-known vergence-accommodation conflict problem due to the lack of the ability to render correct focus cues for 3D scenes. Recently several light field display methods have been explored to reconstruct a true 3D scene by sampling either the projections of the 3D scene at different depths or the directions of the light rays apparently emitted by the 3D scene and viewed from different eye positions. These methods are potentially capable of rendering correct or nearly correct focus cues and addressing the vergence-accommodation conflict problem...
August 7, 2017: Optics Express
https://www.readbyqxmd.com/read/28971118/data-on-eye-behavior-during-idea-generation-and-letter-by-letter-reading
#11
Sonja Walcher, Christof Körner, Mathias Benedek
This article includes the description of data information from an idea generation task (alternate uses task, (Guilford, 1967) [1]) and a letter-by-letter reading task under two background brightness conditions with healthy adults as well as a baseline measurement and questionnaire data (SIPI (Huba et al., 1981) [2]; DDFS (Singer and Antrobus, 1972) [3], 1963; RIBS (Runco et al., 2001) [4]). Data are hosted at the Open Science Framework (OSF): https://osf.io/fh66g/ (Walcher et al., 2017) [5]. There you will find eye tracking data, task performance data, questionnaires data, analyses scripts (in R, R Core Team, 2017 [6]), eye tracking paradigms (in the Experiment Builder (SR Research Ltd...
December 2017: Data in Brief
https://www.readbyqxmd.com/read/28957270/optical-mapping-near-eye-three-dimensional-display-with-correct-focus-cues
#12
Wei Cui, Liang Gao
We present an optical mapping near-eye (OMNI) three-dimensional display method for wearable devices. By dividing a display screen into different subpanels and optically mapping them to various depths, we create a multiplane volumetric image with correct focus cues for depth perception. The resultant system can drive the eye's accommodation to the distance that is consistent with binocular stereopsis, thereby alleviating the vergence-accommodation conflict, the primary cause for eye fatigue and discomfort. Compared with the previous methods, the OMNI display offers prominent advantages in adaptability, image dynamic range, and refresh rate...
July 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28951958/ocular-anatomic-changes-for-different-accommodative-demands-using-swept-source-optical-coherence-tomography-a-pilot-study
#13
José J Esteve-Taboada, Teresa Ferrer-Blasco, Miguel A Aloy, José E Adsuara, Pablo Cerdá-Durán, Petar Mimica, Robert Montés-Micó
PURPOSE: The purpose of our study was to assess the changes in ocular parameters for different accommodative demands using a new optical biometer based on swept-source optical coherence tomography (SS-OCT). METHODS: Seven subjects were included in this pilot study, and only one eye per participant was analyzed. Each eye was measured six times with the optical biometer IOLMaster 700 (Carl Zeiss Meditec, Jena, Germany). As this instrument is not able to change the vergence of the stimulus, to enable measurements at different accommodative states, a tilted first-surface mirror attached to the optical biometer was used to place the fixation stimulus at different vergences...
September 26, 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/28944208/visual-efficiency-among-teenaged-athletes-and-non-athletes
#14
Rokiah Omar, Yau Meng Kuan, Nurul Atikah Zuhairi, Faudziah Abd Manan, Victor Feizal Knight
AIM: To compare visual efficiency, specifically accom-modation, vergence, and oculomotor functions among athletes and non-athletes. METHODS: A cross-sectional study on sports vision screening was used to evaluate the visual skills of 214 elementary students (107 athletes, 107 non-athletes), aged between 13 and 16y. The visual screening assessed visual parameters such as ocular motor alignment, accommodation, and vergence functions. RESULTS: Mean visual parameters were compared between age-group matched athletes (mean age 14...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28913511/accuracy-of-formulae-for-secondary-intraocular-lens-power-calculations-in-pediatric-aphakia
#15
Fouad R Nakhli, Khaled Emarah, Laila Jeddawi
PURPOSE: To compare the accuracy of axial length vergence formulas versus refractive vergence formulas for secondary intraocular lens (IOL) implantation in pediatric aphakia. METHODS: This retrospective comparative study, evaluated 31 eyes of 31 patients aged ≤3.5 years, who had undergone secondary IOL implantation. The median absolute error (MedAE) was compared between axial length vergence formulas (Hoffer Q, Holladay I, SRK II, and SRK/T) and refractive vergence formulas (Lanchulev, Holladay R, Mackool, and Khan) as well as between formulas within the same vergence...
September 2017: Journal of Current Ophthalmology
https://www.readbyqxmd.com/read/28904567/intermittent-divergent-squint-in-prematurity-and-its-neurophysiological-aspects
#16
REVIEW
Kalpana Sharma, Praveen Panwar, Kulbhushan Prakash Chaudhary
Intermittent distance exotropia is a deviation characterized by an exophoria at near fixation and manifest exotropia at distance fixation. There is normal binocular fusional vergence and stereoacuity at near fixation, but the eyes tend to diverge in bright sunlight, tiredness, day dreaming and the patient may close one eye in such circumstances. Prematurity is associated with numerous eye pathology, besides retinopathy of prematurity, amblyopia, refractive errors, it is also associated with a higher risk esotropia and exotropia...
April 2017: Journal of Pediatric Neurosciences
https://www.readbyqxmd.com/read/28889009/gaze-position-interferes-in-body-sway-in-young-adults
#17
Carolina Menezes Fiorelli, Paula Fávaro Polastri, Sérgio Tosi Rodrigues, André Macari Baptista, Tiago Penedo, Vinicius Alota Ignácio Pereira, Lucas Simieli, Fabio Augusto Barbieri
Postural control is influenced by eye movements. Gaze fixation, which comprises a component of ocular vergence, is important in the acquisition of highly specific task information, but its relation to postural control is little investigated. The aim of the study was to investigate the effects of gaze fixation position (central and lateral fixations) on postural sway in young adults. Forty young adults with ages ranging from 20 to 35 years were invited to participate in the study. Postural sway was measured in quiet stance in bipedal support in three 60-s trials under the following conditions: gaze fixation on a target positioned in front of participant, gaze fixation on a target positioned on right side of participant, and gaze fixation on a target positioned on left side of participant...
November 1, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28881134/modeling-%C3%AF-bond-activations-by-nickel-0-beyond-common-approximations-how-accurately-can-we-describe-closed-shell-oxidative-addition-reactions-mediated-by-low-valent-late-3d-transition-metal
#18
Lianrui Hu, Kejuan Chen, Hui Chen
Accurate modelings of reactions involving 3d transition metals (TMs) are very challenging to both ab initio and DFT approaches. To gain more knowledge in this field, we herein explored typical σ-bond activations of H-H, C-H, C-Cl, and C-C bonds promoted by nickel(0), a low-valent late 3d TM. For the key parameters of activation energy (ΔE(‡)) and reaction energy (ΔER) for these reactions, various issues related to the computational accuracy were systematically investigated. From the scrutiny of convergence issue with one-electron basis set, augmented (A) basis functions are found to be important, and the CCSD(T)/CBS level with complete basis set (CBS) limit extrapolation based on augmented double-ζ and triple-ζ basis pair (ADZ and ATZ), which produces deviations below 1 kcal/mol from the reference, is recommended for larger systems...
September 22, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28832612/neck-shoulder-discomfort-due-to-visually-demanding-experimental-near-work-is-influenced-by-previous-neck-pain-task-duration-astigmatism-internal-eye-discomfort-and-accommodation
#19
Camilla Zetterberg, Mikael Forsman, Hans O Richter
Visually demanding near work can cause eye discomfort, and eye and neck/shoulder discomfort during, e.g., computer work are associated. To investigate direct effects of experimental near work on eye and neck/shoulder discomfort, 33 individuals with chronic neck pain and 33 healthy control subjects performed a visual task four times using four different trial lenses (referred to as four different viewing conditions), and they rated eye and neck/shoulder discomfort at baseline and after each task. Since symptoms of eye discomfort may differ depending on the underlying cause, two categories were used; internal eye discomfort, such as ache and strain, that may be caused by accommodative or vergence stress; and external eye discomfort, such as burning and smarting, that may be caused by dry-eye disorders...
2017: PloS One
https://www.readbyqxmd.com/read/28815298/the-interaction-of-pupil-response-with-the-vergence-system
#20
Moritz Feil, Barbara Moser, Mathias Abegg
PURPOSE: A gaze shift from a target at distance to a target at near leads to pupillary constriction. The regulation of this pupillary near response is ill known. We investigated the impact of accommodation, convergence, and proximity on the pupillary diameter. METHODS: We recorded pupil size and vergence eye movements with the use of an infrared eye tracker. We determined the pupillary response in four conditions: (1) after a gaze shift from far to near without accommodation, (2) after a gaze shift from far to near with neither accommodation nor convergence, (3) after accommodation alone, and (4) after accommodation with convergence without a gaze shift to near...
November 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
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