Journal
VISION RESEARCH
Volume 46, Issue 16, Pages 2581-2592Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.visres.2006.02.006
Keywords
accommodation; myopia; reading; accommodative microfluctuations
Categories
Funding
- NEI NIH HHS [T35 EY07149, R01 EY11228, R24 EY014817, T35 EY007149, R01 EY011228] Funding Source: Medline
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Accommodation has long been suspected to be involved in the development of myopia because near work, particularly reading, is known to be a risk factor. In this study, we measured several dynamic characteristics of accommodative behavior during extended periods of reading under close-to-natural conditions in 20 young emmetropic and stable myopic subjects. Accommodative responses, errors, and variability (including power spectrum analysis) were analyzed and related to accommodative demand and subject refractive error. All accommodative behaviors showed large inter-subject variability at all of the reading demands. Accommodative lags and variability significantly increased with closer demands for all subjects (ANOVA, p < 0.05). Myopes had significantly greater variability in their accommodation responses compared to emmetropes (ANOVA, p < 0.05) and had larger accommodative lags at further reading distances (unpaired t test p < 0.05). Power spectrum analysis showed a significant increase in the power of accommodative microfluctuations with closer demands (ANOVA, p < 0.05) and with increasing myopia at the closest reading demand (ANOVA, p < 0.01). The difference in the stability of the accommodative behavior between individuals with different refractive states suggests a possible relationship between variability in accommodation and the development of myopia. (c) 2006 Elsevier Ltd. All rights reserved.
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