The effects of induced oblique astigmatism on symptoms and reading performance while viewing a computer screen

Rosenfield, Mark; Hue, Jennifer E.; Huang, Rae; Bababekova, Yuliya

doi:10.1111/j.1475-1313.2011.00887.x

Cited by 47 publications

(38 citation statements)

References 26 publications

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“…More recently, a 10 min computer reading task performed with 2.00 D induced oblique astigmatic blur resulted in a significant increase in reported eye and vision related symptoms (such as 'tired eyes', 'discomfort in eyes', and 'blurred vision') compared to performing the task with the optimal refractive correction. 123 Although a definitive, causative link between headache/ asthenopia and astigmatism remains to be established, the current evidence does appear to support a potential contribution of uncorrected astigmatism to asthenopic symptoms.…”

Section: Functional Impact Of Astigmatismmentioning

confidence: 62%

“…There is also some experimental evidence to support an association between asthenopic symptoms occurring following specific visual tasks, and even relatively small amounts of uncorrected astigmatism . Wiggins and Daum reported an increase in reported symptoms of visual discomfort in subjects with 0.50 D ATR induced astigmatism following a 25 min computer reading task.…”

Section: Visual and Functional Impact Of Astigmatismmentioning

confidence: 99%

“…121 There is also some experimental evidence to support an association between asthenopic symptoms occurring following specific visual tasks, and even relatively small amounts of uncorrected astigmatism. 122,123 Wiggins and Daum 122 reported an increase in reported symptoms of visual discomfort in subjects with 0.50 D ATR induced astigmatism following a 25 min computer reading task. More recently, a 10 min computer reading task performed with 2.00 D induced oblique astigmatic blur resulted in a significant increase in reported eye and vision related symptoms (such as 'tired eyes', 'discomfort in eyes', and 'blurred vision') compared to performing the task with the optimal refractive correction.…”

Section: Functional Impact Of Astigmatismmentioning

confidence: 99%

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The visual and functional impacts of astigmatism and its clinical management

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Vincent

Collins

2014

Ophthalmic Physiologic Optic

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Purpose: To provide a comprehensive overview of research examining the impact of astigmatism on clinical and functional measures of vision, the short and longer term adaptations to astigmatism that occur in the visual system, and the currently available clinical options for the management of patients with astigmatism. Recent findings: The presence of astigmatism can lead to substantial reductions in visual performance in a variety of clinical vision measures and functional visual tasks. Recent evidence demonstrates that astigmatic blur results in short-term adaptations in the visual system that appear to reduce the perceived impact of astigmatism on vision. In the longer term, uncorrected astigmatism in childhood can also significantly impact on visual development, resulting in amblyopia. Astigmatism is also associated with the development of spherical refractive errors. Although the clinical correction of small magnitudes of astigmatism is relatively straightforward, the precise, reliable correction of astigmatism (particularly high astigmatism) can be challenging. A wide variety of refractive corrections are now available for the patient with astigmatism, including spectacle, contact lens and surgical options. Conclusion: Astigmatism is one of the most common refractive errors managed in clinical ophthalmic practice. The significant visual and functional impacts of astigmatism emphasise the importance of its reliable clinical management. With continued improvements in ocular measurement techniques and developments in a range of different refractive correction technologies, the future promises the potential for more precise and comprehensive correction options for astigmatic patients.

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Section: Functional Impact Of Astigmatismmentioning

confidence: 62%

Section: Visual and Functional Impact Of Astigmatismmentioning

confidence: 99%

Section: Functional Impact Of Astigmatismmentioning

confidence: 99%

See 1 more Smart Citation

The visual and functional impacts of astigmatism and its clinical management

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Vincent

Collins

2014

Ophthalmic Physiologic Optic

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show abstract

“…The astigmatic power and axis orientation have been shown to play an essential role in postoperative visual performance [4][5][6][7][8][9][10][11][12][13]. Several studies have shown that eyes with uncorrected oblique astigmatism have poorer visual performance than those with uncorrected against-the-rule (ATR) or with-the-rule (WTR) astigmatism [14][15][16][17][18][19]. Trindade et al [10] and Nagpal et al [11] reported significantly better uncorrected near visual outcomes in pseudophakic eyes with simple low myopic ATR astigmatism than in those with WTR astigmatism.…”

Section: Introductionmentioning

confidence: 99%

Influence of simple myopic against-the-rule and with-the-rule astigmatism on visual acuity in eyes with monofocal intraocular lenses

Yamamoto¹,

Hiraoka

Beheregaray

et al. 2014

Jpn J Ophthalmol

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“…6 Besides its use as a clinical tool for detecting anomalies in the visual system, good stereoacuity is associated with better long-term stability of alignment and reduced risk for, and lesser severity of, amblyopia, improved achievement of sensorimotor developmental milestones, efficient reading ability and improved quality of life. 9 Given the clinical importance of the near point mechanism, various studies 6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25 have investigated associations of stereoacuity with various anomalies although most of these studies 7,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25 focussed mainly on the association between poor stereoacuity and refractive errors, while empirical studies on the distribution of reduced stereoacuity and possible association between stereoacuity and accommodative-vergence anomalies could not be found.…”

Section: Introductionmentioning

confidence: 99%

Stereoacuity and refractive, accommodative and vergence anomalies of South African school children, aged 13–18 years

Wajuihian¹,

Hansraj²

2018

Afr. vis. eye health

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Aim:The aim of this study was to explore possible associations between stereoacuity and refractive, accommodative and vergence anomalies. Methods:The study design was cross-sectional and comprised data from 1056 high school children aged between 13 and 18 years; mean age and standard deviation were 15.89 ± 1.58 years. Using a multi-stage random cluster sampling, participants were selected from 13 high schools out of a sample frame of 60 schools in the municipality concerned. In the final sample, 403 (38%) were males and 653 (62%) females. Refractive errors, heterophoria, near point of convergence, fusional vergences and accommodative functions (amplitude, facility, response and relative) were evaluated. Stereoacuity was evaluated using the Randot stereotest and recorded in seconds of arc where reduced stereoacuity was defined as worse than 40 s arc.Results: Overall, the mean stereoacuities (in seconds of arc) of the children with anomalies were the following: those with refractive errors (52.6 ± 36.9), with accommodative anomalies (53.1 ± 34.1) and with vergence anomalies (48.29 ± 31.1). The mean stereoacuity of those with vergence anomalies was significantly better than that of those with either refractive errors or accommodative anomalies (p = 0.02). In the refractive error category, only anisometropia had significantly reduced mean stereoacuity compared to emmetropia (Mann-Whitney U: p = 0.01). The mean stereoacuity of cases of accommodative anomalies was significantly reduced compared to those without such anomalies (Mann-Whitney U: p = 0.01). Similarly, the mean stereoacuity of cases with vergence anomalies was significantly reduced compared to those without vergence anomalies (p = 0.02). Conclusion:Refractive errors, accommodative or vergence anomalies are more likely to have reduced mean stereoacuity than cases without such anomalies. Refractive errors or accommodative anomalies had significantly more reduced stereoacuity than vergence anomalies. These findings suggest that the Randot stereotest could be used to identify those with such anomalies, and this study extends knowledge regarding the possible use of stereoacuity as a useful tool to screen for binocular anomalies. Stereoacuity and refractive, accommodative and vergence anomalies of South African school children, aged 13-18 yearsRead online:Scan this QR code with your smart phone or mobile device to read online.

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The effects of induced oblique astigmatism on symptoms and reading performance while viewing a computer screen

Abstract: The presence of induced astigmatism produced a significant increase in post-task symptoms but did not affect reading rate or the number of reading errors. The correction of small astigmatic refractive errors may be important in optimizing patient comfort during computer operation.

Cited by 47 publications

References 26 publications

The visual and functional impacts of astigmatism and its clinical management

The visual and functional impacts of astigmatism and its clinical management

Influence of simple myopic against-the-rule and with-the-rule astigmatism on visual acuity in eyes with monofocal intraocular lenses

Stereoacuity and refractive, accommodative and vergence anomalies of South African school children, aged 13–18 years

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