Firth, A.Y., Leach , C.M., Griffiths , H.J. and Rennie, I.G. (1996) Patterns of Nonlinearity in the Ratio of Stimulus Accommodative Convergence to Accommodation. Middle East Journal of Ophthalmology, 4 (2). pp. 123-127.
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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.
| Item Type: | Article |
|---|---|
| Keywords: | Convergence, accommodative convergence, AC/A ratio |
| Academic Units: | The University of Sheffield > Faculty of Medicine, Dentistry and Health (Sheffield) > School of Medicine (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: | 08 Feb 2013 17:31 |
| Status: | Published |
| Publisher: | Pan Arab Council of Ophthalmology |
| Refereed: | Yes |
| URI: | http://eprints.whiterose.ac.uk/id/eprint/42925 |
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