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KMID : 1011420170220030229
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Journal of Korean Ophthalmic Optics Society
2017 Volume.22 No. 3 p.229 ~ p.236
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Distribution Change of Myopic Astigmatism Eyes According to Age
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Jang Jun-Kyu
Shin Jang-Cheol
Choi Woon-Sang
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Abstract
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Purpose: The purpose of this study was to evaluate the astigmatism power change, distribution change of astigmatism and correlation according to age among total astigmatism, corneal astigmatism and residual astigmatism in myopic astigmatism eyes. Methods: The changes of total astigmatism, corneal astigmatism and residual astigmatism was analyzed according to age in 166 patients(332 eyes) with equivalent refractive power is over -0.50 D. Results: Total with-the-rule astigmatism increased to +1.18±1.13 D at 21~30 years of age and gradually decreased to +0.64±1.16 D at 31~40 years of age and at age 51~60, against-the-rule astigmatism was -0.40±1.12 D. Corneal with-the-rule astigmatism increased to +1.54±0.93 D at 21~30 years of age, then decreased gradually from 31~40 years of age to +0.27±0.94 D at 51~60 years of age. Residual astigmatism was against-the-rule astigmatism at all ages and according to the age did not significantly change. Correlation between total astigmatism and corneal astigmatism were r = 0.892, and total astigmatism and residual astigmatism were r = 0.613, corneal astigmatism and residual astigmatism were correlated with r = 0.184. Conclusions: Total astigmatism and corneal astigmatism were progressed from with-the-rule astigmatism to against-the-rule astigmatism as the age increased. Total astigmatism appeared 10 to 15 years late. Residual astigmatism showed an increase in against-the-rule astigmatism, but the change was not significant. The changes in total astigmatism were highly correlated with changes in corneal astigmatism.
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KEYWORD
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Total astigmatism, Corneal astigmatism, Residual astigmatism, With-the-rule astigmatism, Against-the-rule astigmatism
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