Firth, A.Y., Leach , C.M., Griffiths , H.J. et al. (1 more author) (1996) Patterns of Nonlinearity in the Ratio of Stimulus Accommodative Convergence to Accommodation. Middle East Journal of Ophthalmology, 4 (2). pp. 123-127.
Abstract
Background: This study disputes the assumption that the stimulus accommodative convergence to accommodation (AC/A) ratio is linear. Subjects and Methods: Accommodative convergence induced by minus lenses of varying power (-1.50 to -6.00DS, at intervals of 1.50DS) is measured on the Synoptophore in a group of 96 non-strabismic children aged 6 years 3 months to 11 years 2 months (mean 8.81 ± 1.43 years). Results: The mean AC/A ratios obtained with a stimulus to accommodation of 1.5D; 3.00D; 4.5D; 6.00D are 2.25 ± 1.47; 2.88 ± 1.15; 3.28 ± 1.02; 3.49 ± 0.85 respectively. Five patterns of change in AC/A ratio with stiumulus are described. Conclusion: Further studies in all age groups are necessary to investigate the non-linearity of the AC/A ratio over repeated measurements and the repeatability of the testing method.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Keywords: | Convergence, accommodative convergence, AC/A ratio |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Medicine, Dentistry and Health (Sheffield) > The Medical School (Sheffield) > Clinical Sciences Division North (Sheffield) > Department of Medicine (Sheffield) |
Depositing User: | Miss Alison Y Firth |
Date Deposited: | 06 Apr 2011 16:33 |
Last Modified: | 04 Nov 2017 02:01 |
Status: | Published |
Publisher: | Pan Arab Council of Ophthalmology |
Refereed: | Yes |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:42925 |