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The short-term accommodation response to aniso-accommodative stimuli in isometropia.

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Title: The short-term accommodation response to aniso-accommodative stimuli in isometropia.
Authors: Vincent, Stephen J., Collins, Michael J., Read, Scott A., Ghosh, Atanu, Chen, Christine, Lam, Anthony, Sahota, Sonya, Vo, Rebecca
Source: Ophthalmic & Physiological Optics. Sep2015, Vol. 35 Issue 5, p552-561. 10p. 1 Diagram, 2 Charts, 2 Graphs.
Subjects: Visual accommodation, Refractive errors, Binocular vision, Astigmatism, Autorefractors, Optometry
Abstract: Purpose There have been only a limited number of studies examining the accommodative response that occurs when the two eyes are provided with disparate accommodative stimuli, and the results from these studies to date have been equivocal. In this study, we therefore aimed to examine the capacity of the visual system to aniso-accommodate by objectively measuring the interocular difference in the accommodation response between fellow dominant and non-dominant eyes under controlled monocular and binocular viewing conditions during short-term exposure to aniso-accommodative stimuli. Methods The accommodative response of each eye of 16 young isometropic adults (mean age 22 ± 2 years) with normal binocular vision was measured using an open-field autorefractor during a range of testing conditions; monocularly (accommodative demands ranging from 1.32 to 4.55 D) and binocularly while altering the accommodation demand for each eye (aniso-accommodative stimuli ranging from 0.24 to 2.05 D). Results Under monocular viewing conditions, the dominant and non-dominant eyes displayed a highly symmetric accommodative response; mean interocular difference in spherical equivalent 0.01 ± 0.06 D (relative) and 0.22 ± 0.06 D (absolute) ( p > 0.05). During binocular viewing, the dominant eye displayed a greater accommodative response (0.11 ± 0.34 D relative and 0.24 ± 0.26 D absolute) irrespective of whether the demand of the dominant or non-dominant eye was altered ( p = 0.01). Astigmatic power vectors J0 and J45 did not vary between eyes or with increasing accommodation demands under monocular or binocular viewing conditions ( p > 0.05). Conclusion The dominant and non-dominant eyes of young isometropic individuals display a similar consensual lag of accommodation under both monocular and binocular viewing conditions, with the dominant eye showing a small but significantly greater (by 0.12-0.25 D) accommodative response. Evidence of short-term aniso-accommodation in response to asymmetric accommodation demands was not observed. [ABSTRACT FROM AUTHOR]
Copyright of Ophthalmic & Physiological Optics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: The short-term accommodation response to aniso-accommodative stimuli in isometropia.
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  Data: <searchLink fieldCode="AR" term="%22Vincent%2C+Stephen+J%2E%22">Vincent, Stephen J.</searchLink><br /><searchLink fieldCode="AR" term="%22Collins%2C+Michael+J%2E%22">Collins, Michael J.</searchLink><br /><searchLink fieldCode="AR" term="%22Read%2C+Scott+A%2E%22">Read, Scott A.</searchLink><br /><searchLink fieldCode="AR" term="%22Ghosh%2C+Atanu%22">Ghosh, Atanu</searchLink><br /><searchLink fieldCode="AR" term="%22Chen%2C+Christine%22">Chen, Christine</searchLink><br /><searchLink fieldCode="AR" term="%22Lam%2C+Anthony%22">Lam, Anthony</searchLink><br /><searchLink fieldCode="AR" term="%22Sahota%2C+Sonya%22">Sahota, Sonya</searchLink><br /><searchLink fieldCode="AR" term="%22Vo%2C+Rebecca%22">Vo, Rebecca</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Ophthalmic+%26+Physiological+Optics%22">Ophthalmic & Physiological Optics</searchLink>. Sep2015, Vol. 35 Issue 5, p552-561. 10p. 1 Diagram, 2 Charts, 2 Graphs.
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  Data: <searchLink fieldCode="DE" term="%22Visual+accommodation%22">Visual accommodation</searchLink><br /><searchLink fieldCode="DE" term="%22Refractive+errors%22">Refractive errors</searchLink><br /><searchLink fieldCode="DE" term="%22Binocular+vision%22">Binocular vision</searchLink><br /><searchLink fieldCode="DE" term="%22Astigmatism%22">Astigmatism</searchLink><br /><searchLink fieldCode="DE" term="%22Autorefractors%22">Autorefractors</searchLink><br /><searchLink fieldCode="DE" term="%22Optometry%22">Optometry</searchLink>
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  Data: Purpose There have been only a limited number of studies examining the accommodative response that occurs when the two eyes are provided with disparate accommodative stimuli, and the results from these studies to date have been equivocal. In this study, we therefore aimed to examine the capacity of the visual system to aniso-accommodate by objectively measuring the interocular difference in the accommodation response between fellow dominant and non-dominant eyes under controlled monocular and binocular viewing conditions during short-term exposure to aniso-accommodative stimuli. Methods The accommodative response of each eye of 16 young isometropic adults (mean age 22 ± 2 years) with normal binocular vision was measured using an open-field autorefractor during a range of testing conditions; monocularly (accommodative demands ranging from 1.32 to 4.55 D) and binocularly while altering the accommodation demand for each eye (aniso-accommodative stimuli ranging from 0.24 to 2.05 D). Results Under monocular viewing conditions, the dominant and non-dominant eyes displayed a highly symmetric accommodative response; mean interocular difference in spherical equivalent 0.01 ± 0.06 D (relative) and 0.22 ± 0.06 D (absolute) ( p > 0.05). During binocular viewing, the dominant eye displayed a greater accommodative response (0.11 ± 0.34 D relative and 0.24 ± 0.26 D absolute) irrespective of whether the demand of the dominant or non-dominant eye was altered ( p = 0.01). Astigmatic power vectors J0 and J45 did not vary between eyes or with increasing accommodation demands under monocular or binocular viewing conditions ( p > 0.05). Conclusion The dominant and non-dominant eyes of young isometropic individuals display a similar consensual lag of accommodation under both monocular and binocular viewing conditions, with the dominant eye showing a small but significantly greater (by 0.12-0.25 D) accommodative response. Evidence of short-term aniso-accommodation in response to asymmetric accommodation demands was not observed. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Ophthalmic & Physiological Optics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Text: English
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      – SubjectFull: Refractive errors
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      – SubjectFull: Binocular vision
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      – SubjectFull: Astigmatism
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              Text: Sep2015
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