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Dayna S. Dalton, Karen J. Cruickshanks, Alex Pinto, Barbara E. Klein, Ronald Klein, Guan-Hua Huang; Accommodation in the Beaver Dam Offspring Study. Invest. Ophthalmol. Vis. Sci. 2012;53(14):1361.
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© ARVO (1962-2015); The Authors (2016-present)
To objectively measure accommodative ability in a large cohort of adults.
Subjects (N=2443, aged 21-84 years) were participants in the Beaver Dam Offspring Study. A Grand Seiko Autorefractor was used to obtain 3 measures of refractive error: distance correction, and with correction focusing on a near target at 2 and 4.5 diopters. Readings were converted to spherical equivalent (sphere + ½ cylinder) (SE). Participants were classified as myopic (SE ≤ -1.00), hyperopic (SE ≥ +1.00) or emmetropic (SE > -1.00 and < +1.00). At each of the two near point targets, the participant was considered to have lost accommodative ability if the spherical equivalent was ≥ -0.50. Subjects with cataract surgery were excluded.
In preliminary analyses 48% of participants did not accommodate at the 4.5D target and 45% did not accommodate at either target. Loss of ability to accommodate increased with age (OR 4.61; 95% CI 4.09-5.20, for each 5 year increase in age). Hyperopes were less likely to have loss of accommodative ability (OR compared to emmetropes, 0.40; 95% CI 0.27 - 0.60). Myopia and sex were not associated with accommodative ability. 11% of subjects 55-64 years and 8% of subjects 65-84 years retained accommodative ability.
These measured data indicate that although loss of accommodative ability is very common in aging adults some older subjects retained accommodative ability. Some modifiable factors may be associated with age-related changes in accommodative ability.
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