Vision and Athletic Performance: Data from Agility Dogs

2018 ◽  
pp. 38-47
Keyword(s):  
Binocular Vision ◽  
Refractive Error ◽  
Athletic Performance ◽  
Individual Case ◽  
Spherical Equivalent ◽  
Physical Attributes ◽  
Eye Alignment ◽  
Vision Therapy ◽  
The Relationship ◽  
Cover Test

Background: To explore the relationship between vision problems and athletic performance, we measured refractive error and binocular vision in highly trained canine athletes. This group offers the opportunity to examine vision effects pristinely, without any influence of corrective lenses or vision therapy. Such a study is impossible in humans, but can add insight about the influence vision has on athletic performance in general. Methods: 210 dogs were recruited via word of mouth and examined at agility events in California, Texas, and Washington for cover test near and far, prism bar vergence near and far, Hirschberg and Bruckner tests for eye alignment, and retinoscopy. Owners and/or trainers categorized each dog as a good or poor jumper. Results: 190 dogs qualified; 54 (28.4%) had binocular disorders and 136 (71.6%) did not. Among those without binocular problems, mean SE was +0.07 D for good jumpers and -0.82 D for poor jumpers; poor jumpers were significantly more myopic and had more astigmatism than good jumpers. However, because the distribution of refractive errors in our sample was broad (from -3.00 to +3.00 spherical equivalent), some myopic dogs were good jumpers and some emmetropic and hyperopic dogs were poor jumpers. Binocular vision problems had a separate and sometimes additive effect, with anisometropia and unilateral (constant) strabismus more strongly related to poor jumping than alternating strabismus. Regression analysis showed that binocular competence had relatively more weight in jumping than refraction. Conclusions: Refractive error and binocular problems can affect jumping behavior in highly trained canine athletes. However, these vision problems are not predictive for any individual case, and as with human athletes, some individuals appear able to overcome physical attributes that for others are limiting. The results support the importance of vision, and in particular binocular and refractive problems, to athletic performance for humans as well as canines.

scholarly journals Symptomatic classic convergence insufficiency treated with dot card orthoptic exercise

2016 ◽  
Vol 5 (1) ◽  
Author(s):  
Charles Darko-Takyi ◽  
Kofi Asiedu
Keyword(s):  
Developing Countries ◽  
Binocular Vision ◽  
Refractive Error ◽  
Female Student ◽  
Convergence Insufficiency ◽  
Vision Assessment ◽  
African Patients ◽  
Vision Therapy

Although lots of studies have been reported on convergence insufficiency (CI), no specific case of CI among African patients has been reported. We report a case of symptomatic <em>classic</em> convergence insufficiency in a female student who previously had been misdiagnosed and managed for refractive error. This case highlights the need for comprehensive binocular vision assessment, administration of validated symptom questionnaires in cases of suspicious CI, and the use of simple and inexpensive vision therapy procedures to manage CI in optometric centres in developing countries.

scholarly journals Study of Cataract in Relation to Axial Length and Refractivity of the Eye

1970 ◽  
Vol 12 (3) ◽  
pp. 130-134
Author(s):  
Surabhi Sharma ◽  
Satyaswarup Tripathy ◽  
Syed Ali Raza Rizvi
Keyword(s):  
Refractive Error ◽  
Axial Length ◽  
Age Groups ◽  
Nuclear Cataract ◽  
Spherical Equivalent ◽  
Posterior Subcapsular Cataract ◽  
Age Related ◽  
Different Types ◽  
The Relationship ◽  
Axial Myopia

Aim: To ascertain the association between different types and densities of age-related cataract with axial length and refractive state of the eye.Methods: This prospective observational institute-based study enrolled 462 eyes of 450 patients aged 40 years or older. Eyes were classified as myopic (axial length, >25 mm), emmetropic (axial length, 21-25 mm), and hypermetropic (axial length, <21 mm). Refractive error was defined as myopia (spherical equivalent, <-0.5 D) and hypermetropia (spherical equivalent, >+0.5 D). Cataract was categorised as nuclear, cortical, or posterior subcapsular. Nuclear density was measured based on the Emery and Little Classification after slit-lamp biomicroscopy. Student t test for unpaired samples and Fisher and Yates tables were used to analyse statistical significance.Results: Emmetropia was the most common condition (417 eyes). The most common cataract combination was nuclear with posterior subcapsular (n = 198; 44%). In the axial myopia group, nuclear cataract was thecommonest type, alone or in combination with other types (n = 33; 100%). Most eyes had refractive error of 0 to -5 D. The grade of nuclear cataract increased with increasing age (n = 48 for grade IV nuclear cataract in the 70 to 79 years age group). In all age groups, a higher grade of nuclear sclerosis was significantly associated with axial length (t = 2.2; p < 0.05). The relationship was also significant for posterior subcapsular cataract (t = 2.7; p < 0.05).Conclusions: Nuclear cataract leads to a myopic shift in refraction. In otherwise healthy eyes, there is a gradual hypermetropic shift. The prevalence and grade of nuclear cataract increases with age. Longer axial length is associated with a higher grade of nuclear and posterior subcapsular cataract.

scholarly journals The Correlations between Horizontal and Vertical Peripheral Refractions and Human Eye Shape Using Magnetic Resonance Imaging in Highly Myopic Eyes

Healthcare ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 966
Author(s):  
Hui-Ying Kuo ◽  
John Ching-Jen Hsiao ◽  
Jing-Jie Chen ◽  
Chi-Hung Lee ◽  
Chun-Chao Chuang ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Shape Deformation ◽  
Spherical Equivalent ◽  
Horizontal Meridian ◽  
Resonance Imaging ◽  
Vertical Meridian ◽  
Useful Knowledge ◽  
Human Eye ◽  
The Relationship

The aim of this study was to determine the relationship between relative peripheral refraction and retinal shape by 2-D magnetic resonance imaging in high myopes. Thirty-five young adults aged 20 to 30 years participated in this study with 16 high myopes (spherical equivalent < −6.00 D) and 19 emmetropes (+0.50 to −0.50 D). An open field autorefractor was used to measure refractions from the center out to 60° in the horizontal meridian and out to around 20° in the vertical meridian, with a step of 3 degrees. Axial length was measured by using A-scan ultrasonography. In addition, images of axial, sagittal, and tangential sections were obtained using 2-D magnetic resonance imaging. The highly myopic group had a significantly relative peripheral hyperopic refraction and showed a prolate ocular shape compared to the emmetropic group. The highly myopic group had relative peripheral hyperopic refraction and showed a prolate ocular form. Significant differences in the ratios of height/axial (1.01 ± 0.02 vs. 0.94 ± 0.03) and width/axial (0.99 ± 0.17 vs. 0.93 ± 0.04) were found from the MRI images between the emmetropic and the highly myopic eyes (p < 0.001). There was a negative correlation between the retina’s curvature and relative peripheral refraction for both temporal (Pearson r = −0.459; p < 0.01) and nasal (Pearson r = −0.277; p = 0.011) retina. For the highly myopic eyes, the amount of peripheral hyperopic defocus is correlated to its ocular shape deformation. This could be the first study investigating the relationship between peripheral refraction and ocular dimension in high myopes, and it is hoped to provide useful knowledge of how the development of myopia changes human eye shape.

scholarly journals Myopia progression from wearing first glasses to adult age: the DREAM Study

2021 ◽  
pp. bjophthalmol-2020-316234
Author(s):  
Jan Roelof Polling ◽  
Caroline Klaver ◽  
Jan Willem Tideman
Keyword(s):  
Retrospective Study ◽  
The Netherlands ◽  
Refractive Error ◽  
High Myopia ◽  
Prognostic Indicator ◽  
Treatment Intensity ◽  
Spherical Equivalent ◽  
Inclusion Criteria ◽  
Myopia Progression ◽  
Adult Age

PurposeData on myopia progression during its entire course are scarce. The aim of this study is to investigate myopia progression in Europeans as a function of age and degree of myopia from first prescription to final refractive error.MethodsThe Drentse Refractive Error and Myopia Study assessed data from a branch of opticians in the Netherlands from 1985 onwards in a retrospective study. First pair of glasses prescribed was defined as a spherical equivalent of refraction (SER) ≤−0.5 D to ≥−3.0 D. Subjects with prescriptions at an interval of at least 1 year were included in the analysis.ResultsA total of 2555 persons (57.3% female) met the inclusion criteria. Those with first prescription before the age of 10 years showed the strongest progression (−0.50 D; IQR: −0.75 to −0.19) and a significantly (p<0.001) more negative median final SER (−4.48 D; IQR: −5.37 to −3.42). All children who developed SER ≤−3 D at 10 years were highly myopic (SER ≤−6D) as adults, children who had SER between −1.5 D and −3 D at 10 years had 46.0% risk of high myopia, and children with SER between −0.5 D and −1.5 D had 32.6% risk of high myopia. Myopia progression diminished with age; all refractive categories stabilised after age 15 years except for SER ≤−5 D who progressed up to −0.25 D annually until age 21 years.ConclusionOur trajectories of the natural course of myopia progression may serve as a guide for myopia management in European children. SER at 10 years is an important prognostic indicator and will help determine treatment intensity.

LAX-Score

2021 ◽  
Vol 5 (3) ◽  
pp. 1-28
Author(s):  
Woosub Jung ◽  
Amanda Watson ◽  
Scott Kuehn ◽  
Erik Korem ◽  
Ken Koltermann ◽  
...  
Keyword(s):  
Ncaa Division I ◽  
Athletic Performance ◽  
High Performance ◽  
Performance Enhancement ◽  
Ground Truth ◽  
Division I ◽  
Sports Science ◽  
Player Performance ◽  
The Relationship ◽  
Game Performance

For the past several decades, machine learning has played an important role in sports science with regard to player performance and result prediction. However, it is still challenging to quantify team-level game performance because there is no strong ground truth. Thus, a team cannot receive feedback in a standardized way. The aim of this study was twofold. First, we designed a metric called LAX-Score to quantify a collegiate lacrosse team's athletic performance. Next, we explored the relationship between our proposed metric and practice sensing features for performance enhancement. To derive the metric, we utilized feature selection and weighted regression. Then, the proposed metric was statistically validated on over 700 games from the last three seasons of NCAA Division I women's lacrosse. We also explored our biometric sensing dataset obtained from a collegiate team's athletes over the course of a season. We then identified the practice features that are most correlated with high-performance games. Our results indicate that LAX-Score provides insight into athletic performance beyond wins and losses. Moreover, though COVID-19 has stalled implementation, the collegiate team studied applied our feature outcomes to their practices, and the initial results look promising with regard to better performance.

Successful Combination Therapy for Amblyopia Secondary to Micro-Esotropia And Anisometropia

2021 ◽  
pp. 195-200
Keyword(s):  
Visual Acuity ◽  
Combination Therapy ◽  
Refractive Error ◽  
Combination Treatment ◽  
Current Treatment ◽  
Short Term ◽  
Eccentric Fixation ◽  
Case Summary ◽  
Vision Therapy ◽  
Spectacle Correction

Background: Micro-esotropia is a small-angle esodeviation typically less than nine prism diopters. Patients with this ocular condition often develop amblyopia due to the presence of a constant unilateral strabismus and an anisometropic refractive error in the deviated eye. Current treatment methods for strabismic and refractive amblyopia include spectacle correction, patching, and vision therapy (VT). Case Summary: A 9-year-old Asian female presented with a constant left primary micro-esotropia with unsteady eccentric fixation, contributing to mild amblyopia and frequent suppression in the left eye. She also had a hyperopic anisometropic refractive error. Combination treatment of in-office VT with short-term patching therapy (two hours per day) was administered, with the goal of improving her binocularity, fixation, and visual acuity. Conclusions: Amblyopia results from binocular dysfunction, therefore monocular patching therapy alone will not improve the underlying issue. VT is necessary to actively treat binocularity and subsequently improve visual acuity, while short-term patching can be used in combination to effectively target monocular accommodation and fixation.

scholarly journals A calculator proposal for estimating refractive error after 3 years using the onset biometric values in primary school children: a cohort study

2021 ◽  
Author(s):  
Feride Tuncer Orhan ◽  
Haluk Huseyin Gürsoy
Keyword(s):  
Primary School ◽  
Anterior Chamber ◽  
Refractive Error ◽  
Axial Length ◽  
Anterior Chamber Depth ◽  
Primary School Children ◽  
Optical Parameters ◽  
Spherical Equivalent ◽  
Final Data ◽  
The Mean

Aim To evaluate consecutive measurements of the biometric parameters, age, and refraction error in a Turkish population at primary school age. Materials and Methods A total of 197 children aged between 7-12 years were included. The data of three consecutive measurements of children, who were examined at least once a year for three years using both cycloplegic auto-refractometry and optical biometry, were used in this retrospective study. Spherical equivalent <-0.50D was considered to be myopic; >+0.75D was considered to be hypermetropic. Age, gender, body mass index, spherical equivalent, axial length, anterior chamber depth, central corneal thickness, keratometry, and lens thickness were analyzed. The onset data obtained in 2013 whereas, the final data were from 2015. Logistic and Cox regression analyses were performed (p<0.05). Results The mean of the onset and the final spherical equivalents were 0.19D (0.56), and 0.08D (0.80), respectively. The myopia prevalence was increased among refractive errors in observation periods (univariable analysis p=0.029; multivariable analysis p=0.017). The onset axial length (HR:4.55, 95%CI:2.87-7.24, p<0.001), keratometry (HR:2.04, 95%CI:1.55-2.67, p<0.001) and age (HR:0.73, 95%CI: 0.57-0.92, p=0.009) correlated myopia progression. To calculate the estimated spherical equivalent, the onset data were included in the logistic regression model. The onset data of spherical equivalent (β=0.916, p<0.001), axial length (β=-0.451, p<0.001), anterior chamber depth (β=0.430, p=0.005) and keratometry (β=-0.172, p<0.001) were found to be significantly associated with the mean SE at the final data. Conclusions To calculate the estimated spherical equivalent following three years, an equation was proposed. The estimated refractive error of children can be calculated by using the proposed equation with the associated onset optical parameters.

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