TY - JOUR
T1 - Hyperopia and lens power in an adult population
T2 - The shahroud eye study
AU - Iribarren, Rafael
AU - Hashemi, Hassan
AU - Khabazkhoob, Mehdi
AU - Morgan, Ian
AU - Emamian, Mohammad
AU - Shariati, Mohammad
AU - Fotouhi, Akbar
N1 - Publisher Copyright:
© 2015 Journal of Ophthalmic and Vision Research | Published by Wolters Kluwer - Medknow.
PY - 2015/10
Y1 - 2015/10
N2 - Purpose: To explore the relationship between lens power and refractive error in older adults following age-related hyperopic shifts. Methods: From the Shahroud Eye Cohort Study, subjects aged 55-64 years without clinically significant cataracts (with nuclear opacity of grade 0 to 1) were included to maximize the proportion of subjects with age-related hyperopic shifts that normally occur between 40 to 60 years of age, before interference from the myopic shift due to nuclear cataracts. Mean axial length (AL) values, corneal power, anterior chamber depth, lens thickness, and lens power were analyzed and compared among three refractive groups (myopes, emmetropes, and hyperopes). Results: A total of 1,006 subjects including 496 (49.63%) male subjects were studied. Corneal power was similar in all refractive groups. Hyperopes had + 1.69 diopters higher mean spherical equivalent refractive error and - 0.50 mm shorter AL than emmetropes. Myopes had 0.67 mm longer AL than emmetropes. Hyperopes had significantly increased lens thickness as compared to emmetropes (4.42 vs. 4.39 mm respectively). In this adult sample, the hyperopic group had lower lens power (+22.29 diopters vs. +22.54 diopters in emmetropes, P = 0.132). Myopes had similar lens power as emmetropes. Conclusion: Axial length is the principal determinant of refractive errors. Lens power may have importance in determining hyperopia in adults free of cataract.
AB - Purpose: To explore the relationship between lens power and refractive error in older adults following age-related hyperopic shifts. Methods: From the Shahroud Eye Cohort Study, subjects aged 55-64 years without clinically significant cataracts (with nuclear opacity of grade 0 to 1) were included to maximize the proportion of subjects with age-related hyperopic shifts that normally occur between 40 to 60 years of age, before interference from the myopic shift due to nuclear cataracts. Mean axial length (AL) values, corneal power, anterior chamber depth, lens thickness, and lens power were analyzed and compared among three refractive groups (myopes, emmetropes, and hyperopes). Results: A total of 1,006 subjects including 496 (49.63%) male subjects were studied. Corneal power was similar in all refractive groups. Hyperopes had + 1.69 diopters higher mean spherical equivalent refractive error and - 0.50 mm shorter AL than emmetropes. Myopes had 0.67 mm longer AL than emmetropes. Hyperopes had significantly increased lens thickness as compared to emmetropes (4.42 vs. 4.39 mm respectively). In this adult sample, the hyperopic group had lower lens power (+22.29 diopters vs. +22.54 diopters in emmetropes, P = 0.132). Myopes had similar lens power as emmetropes. Conclusion: Axial length is the principal determinant of refractive errors. Lens power may have importance in determining hyperopia in adults free of cataract.
KW - Cross-sectional Study
KW - Hyperopia
KW - Lens Power
UR - http://www.scopus.com/inward/record.url?scp=84959477818&partnerID=8YFLogxK
U2 - 10.4103/2008-322X.158895
DO - 10.4103/2008-322X.158895
M3 - Article
SN - 2008-2010
VL - 10
SP - 400
EP - 407
JO - Journal of Ophthalmic and Vision Research
JF - Journal of Ophthalmic and Vision Research
IS - 4
ER -