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accommodative phoria

Jerome Ozkan, Cathleen Fedtke, Jiyoon Chung, Varghese Thomas, Ravi Chandra Bakaraju
OBJECTIVES: To investigate whether adaptation of accommodative responses occurred in non-presbyopic myopes fitted with four multifocal contact lens (MFCL) designs. METHODS: Prospective, subject-masked clinical investigation comprising 40 experienced myopic lens wearers (18-25 years) fitted bilaterally with single-vision (SV) control lens (Air Optix Aqua [Alcon, Fort Worth, TX]) and randomized to two of four test MFCL (Proclear MFCL [Distance and Near] [CooperVision, Pleasanton, CA], Air Optix Aqua MFCL, Purevision MFCL [Bausch & Lomb, Rochester, NY])...
June 20, 2016: Eye & Contact Lens
José E Capó-Aponte, Kendra L Jorgensen-Wagers, Josue A Sosa, David V Walsh, Gregory L Goodrich, Leonard A Temme, Daniel W Riggs
PURPOSE: To assess the prevalence of visual dysfunctions and associated symptoms in war fighters at different stages after non-blast- or blast-induced mild traumatic brain injury (mTBI). METHODS: A comprehensive retrospective review of the electronic health records of 500 U.S. military personnel with a diagnosis of deployment-related mTBI who received eye care at the Landstuhl Regional Medical Center. For analysis, the data were grouped by mechanism of injury, and each group was further divided in three subgroups based on the number of days between injury and initial eye examination...
February 17, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
Huiling Lin, Björn Drobe, Wanqing Jin, Meng Lin, Yunyun Chen, Hao Chen
PURPOSE: To investigate the effects of different near addition lenses and prisms on accommodative microfluctuations (AMFs) in Chinese early-onset myopic (EOM) and emmetropic (EMM) children. METHODS: Twenty-one EMM and 27 EOM children aged between 9 and 14years participated in the study. At near, 23 children were exophoric (exo, <0 Δ), and 25 were esophoric (eso, ≥0 Δ). The AMFs and phoria through multiple addition lenses (-1.00, 0, +1.00, +2.00, and +3.00D on each eye) and prisms (base-in prism power: 3 Δ, 2 Δ, 1 Δ; and base-out prism power: 1 Δ and 2 Δ on each eye) were measured at 25cm under binocular viewing conditions with a Grand Seiko WAM-5500 auto-refractor and a modified Thorington card...
May 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
Thomas A Aller, Maria Liu, Christine F Wildsoet
PURPOSE: Most studies have reported only minimal reductions in myopia progression with bifocal or progressive multifocal spectacles, although somewhat larger, although mostly still clinically insignificant, effects have been reported in children with nearpoint esophoria and/or accommodative dysfunctions. The CONTROL study was a 1-year, prospective, randomized, clinical trial of bifocal contact lenses for control of myopia in children with eso fixation disparities at near. METHODS: Eighty-six myopic subjects, aged 8 to 18 years, were enrolled in the study after passing the screening examination...
April 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
Xinping Yu, Jinhua Bao, Björn Drobe, Wenhui Lv, Ge Wu, Jinling Xu, Hao Chen
PURPOSE: To compare personalized near addition values for myopic children that induce a reasonable phoria (Ph) (meeting Sheard's criterion) and induce a null lag of accommodation at near and to evaluate changes in these metrics after lens adaptation. METHODS: Fifty-three myopic children participated in this study. Accommodative response, Ph, and fusional amplitudes (FAs) were measured at 33 cm through multiple addition lenses (0D, +1.00D, +1.50D, +2.00D, +2.50D, +3...
January 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
Pauline Kang, Christine F Wildsoet
PURPOSE: To characterise the effects on accommodation and binocular vision in young adults of 2 distance centre multifocal soft contact lenses (MFSCLs), differing in add power. METHODS: Twenty-four young adult myopes (18-28 years; 20 females, 4 males) had baseline visual acuity, accommodation, near phoria, fixation disparity and stereopsis data collected with single vision (SV) SCLs. The same set of measurements was repeated immediately after subjects were fitted with each of two MFSCLs (with either +1...
April 2016: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
Simon Watt, Louise Ryan
Conventional stereoscopic imagery presents conflicting stimuli to vergence and accommodation. With sufficient conflict, vergence-accommodation coupling causes inaccurate responses in one or both systems, impairing stereoscopic depth perception, or preventing it altogether. We examined tolerance of stereo depth perception to stimuli presented in-front-of and behind the screen, and examined factors that might predict it, including phoria, and decreased ability to accommodate with age (presbyopia). We characterised accommodation of observers aged 20 to 68 years using the slope of the linear portion of their stimulus-response functions...
2015: Journal of Vision
Yaping Gao, Liping Chen, Shun-nan Yang, Haiying Wang, Jiaxin Yao, Qun Dai, Shuzhi Chang
PURPOSE: Monitoring and intercepting a fast approaching object is a critical skill for many sports. Athletes might be distinguished from nonathletes based on their ability to access various visual abilities to accomplish interceptive actions. Here, we examined whether interceptive visuomotor skills of athletes and nonathletes are differently correlated to a hierarchy of visuo-oculomotor abilities related to the perception of motion in depth. METHODS: Eighty-six athletes in interceptive sports, as well as 60 nonathletes, were recruited based on their sport performance and prior experiences...
June 2015: Optometry and Vision Science: Official Publication of the American Academy of Optometry
Neethu G Abraham, Krithica Srinivasan, Jyothi Thomas
BACKGROUND: Measurement of for near point of convergence (NPC), amplitude of accommodation (AA) and phoria are important components of diagnosing nonstrabismic binocular vision anomalies. There is a huge variation in the normative data established for orthoptic parameters because of the variation in measurement technique. There are only limited studies for normative data based on nonclinical population in Indian population. Therefore, we aim estimate the normative values for NPC, AA, and phoria measurement in Indian population using techniques, which has good repeatability and reliability...
January 2015: Oman Journal of Ophthalmology
Vidhyapriya Sreenivasan, Elizabeth L Irving, William R Bobier
Investigations into the progression of myopia in children have long considered the role of accommodation as a cause and solution. Myopic children show high levels of accommodative adaptation, coupled with accommodative lag and high response AC/A (accommodative convergence per diopter of accommodation). This pattern differs from that predicted by current models of interaction between accommodation and vergence, where weakened reflex responses and a high AC/A would be associated with a low not high levels of accommodative adaptation...
August 2014: Vision Research
Horst Mayer
BACKGROUND: During many years of occupational stress research, mostly within the German governmental program for "Humanization of Work Life'', remarkable deficits concerning visual work were seen, the most striking being the lack of cooperation between the different experts. OBJECTIVE: With regard to this article hard arguments and ideas for solutions had to be found. METHODS/PARTICIPANTS: A pilot study in 21 enterprises was realized (1602 employees with different visual work tasks)...
January 1, 2014: Work: a Journal of Prevention, Assessment, and Rehabilitation
Desmond Cheng, George C Woo, Bjorn Drobe, Katrina L Schmid
IMPORTANCE: Myopia is a significant public health problem, making it important to determine whether a bifocal spectacle treatment involving near prism slows myopia progression in children. OBJECTIVE: To determine whether bifocal and prismatic bifocal spectacles control myopia in children with high rates of myopia progression and to assess whether the treatment effect is dependent on the lag of accommodation and/or near phoria status. DESIGN, SETTING, AND PARTICIPANTS: This 3-year randomized clinical trial was conducted in a private practice...
March 2014: JAMA Ophthalmology
Hans O Richter
A time honored dictum states that the eyes "lead the body", i.e., that the body typically adjusts its position to compensate for an impoverished retinal image (e.g., as due to optical blur, and/or inappropriately sized visual target). But only moderate or low level of evidence exists in support of this view. Inconclusive evidence does not, however, equal negative evidence. The accommodation/vergence system does exhibit signs of overload in contemporary working life, including eye discomfort, transient myopia, altered pattern of eye-lens oscillations, and associated phoria...
January 1, 2014: Work: a Journal of Prevention, Assessment, and Rehabilitation
Mabel M P Leung, Carly S Y Lam, Sutie S T Lam, Natalie W Y Pao, Cecilia W P Li-Tsang
The purpose of this study was to find out the visual profiles of children with handwriting difficulties (HWD) in Hong Kong Chinese. Forty-nine children with HWD (mean age 8.4 ± 1.1 years) and 27 controls (mean age 7.7 ± 0.7 years) were recruited. All subjects received eye examination and vision assessment included ocular health, refraction, accommodative functions, binocularity, visual perception (by Gardner reversal frequency test: recognition subtest; Test of visual perceptual skills (non-motor)-revised) and motor skills (by The Beery-Buktenica developmental test of visual motor integration; Detroit test of motor speed and precision)...
January 2014: Research in Developmental Disabilities
Hamed Momeni-Moghaddam, David A Goss, Mina Sobhani
BACKGROUND: The neurological linkage of vergence and accommodation is a factor which can affect accuracy of accommodation, is in turn associated with symptoms of near-related visual discomfort. The purpose of this study was to compare the accommodative response under monocular and binocular conditions in symptomatic and asymptomatic participants with different near phorias. METHODS: Seventy students at Zahedan University of Medical Sciences, Iran (mean age: 21.2 ± 1...
January 2014: Clinical & Experimental Optometry: Journal of the Australian Optometrical Association
José E Capó-Aponte, Aaron K Tarbett, Thomas G Urosevich, Leonard A Temme, Navjit K Sanghera, Melvyn E Kalich
The prevalence of oculomotor dysfunctions associated with blast-induced mild traumatic brain injury (mTBI) in warfighters has increased as a consequence of recent conflicts. This study evaluated the effectiveness of computerized oculomotor vision screening (COVS) in a military population. Oculomotor functions were assessed with COVS and by conventional methods in 20 U.S. military personnel with and 20 without mTBI. The validity of COVS was determined by Pearson correlation and Bland-Altman method or the kappa coefficient...
2012: Journal of Rehabilitation Research and Development
Marika Wahlberg-Ramsay, Malin Nordström, Jasna Salkic, Rune Brautaset
BACKGROUND: Prevalence of dyslexia is 5%-10% of the population. Opinions differ on how binocular function affects dyslexia. The aim of the present study was to evaluate the binocular function in dyslexic children and compare it with a group of age-matched control children. METHODS: The study was performed at Ängkärrskolan and at Kungsholmen elementary schools in Stockholm, Sweden. Sixty-three children with dyslexia and 60 control children between fourth and ninth grade participated...
December 2012: Strabismus
R Gómez de Liaño-Sánchez, R Borrego-Hernando, G Franco-Iglesias, P Gómez de Liaño-Sánchez, A Arias-Puente
OBJECTIVE: To evaluate factors that may decompensate a strabismus or lead to diplopia after refractive surgery. METHODS: Retrospective study of 19 patients, who presented with binocular decompensation after refractive surgery. Mean age at surgery was 38.89 SD 10.26 (27-63) years. Fourteen patients were myopic, 5 hyperopic, and 5 of them had a marked anisometropia. The photo-refractive keratectomy procedure was used in 3 cases, laser-assisted in situ keratomileusis (LASIK) in 13, posterior chamber-IOL)+LASIK in one of them, and bilateral IOL in 2 cases...
November 2012: Archivos de la Sociedad Española de Oftalmología
Shi-Ming Li, Si-Yuan Li, Luo-Ru Liu, Ji-Yuan Guo, Wei Chen, Ning-Li Wang, Michel Millodot
BACKGROUND: To determine the difference in the rate of myopic progression between children wearing single vision lenses with undercorrection of +0.50 D and children whose myopia is fully corrected, and to explore the factors that may influence the process. DESIGN: Randomized, controlled, double-blind trial. PARTICIPANTS: Two hundred children aged 7-15 years with low-to-moderate myopia (-1.5 D to -6.0 D), astigmatism <-1.5 D and anisometropia <1...
May 2013: Clinical & Experimental Ophthalmology
David A Goss, Sania Rana, Julie Ramolia
PURPOSE: Monocular estimation method (MEM) dynamic retinoscopy and low neutral (LN) dynamic retinoscopy are common procedures for evaluating the need for near-point plus adds for improved near-point performance in non-presbyopes. A combination of MEM and LN has been suggested to be a method of plotting accommodative response/accommodative stimulus functions and evaluating guidelines for prescribing from MEM. METHODS: Using a combined MEM-LN procedure, MEM was performed on 80 young adults at 40 cm, with distance correction and with plus adds in 0...
October 2012: Optometry and Vision Science: Official Publication of the American Academy of Optometry
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