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KMID : 1011420140190030377
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Journal of Korean Ophthalmic Optics Society
2014 Volume.19 No. 3 p.377 ~ p.382
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Correlation between Anterior and Posterior Corneal Astigmatism in Total Corneal Astigmatism
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Kim Hyo-Jin
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Abstract
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Purpose: To investigate the effect of anterior, posterior corneal astigmatism and total corneal astigmatism on posterior corneal astigmatism by analyzing correlation.
Methods: Participants were 31 patients (31 eyes) without corneal disease at the age range of 22 to 28 who had visited hospital to receive corneal refractive surgery. The total corneal astigmatism and anterior and posterior corneal astigmatism were measured using a rotating scheimpflug camera before surgery. The magnitude of astigmatism was calculated with the difference between the meridian of the steep refractive power and the flat, and With-The-Rule and inverse astigmatism were divided according to the direction of the meridian that was the steepest.
Results: The averages of total corneal astigmatism and anterior and posterior astigmatism were found to be 1.13±0.76 D, 1.51±0.84 D, and ?0.59±0.17 D. The magnitude of posterior corneal astigmatism was distributed between ?1.0 D and -0.25 D in all the subjects, and when the magnitude of total corneal astigmatism was set as 100, the magnitude of anterior corneal astigmatism was 142.9±29.9%. Total corneal astigmatism indicated the highest correlation with the magnitude of anterior astigmatism (y = 0.871x?0.184, R2=0.982) and high negative correlation with posterior astigmatism (y = ?2.974x?0.184, R2=0.698). All the subjects’ anterior and posterior corneal astigmatism was classified into With-The-Rule.
Conclusions: Anterior and posterior corneal astigmatism in the subjects in their 20’s showed the magnitude of ?3.8 D in 0.2 D and ?0.25 D in ?1.0 D separately, and both anterior and posterior astigmatism indicated a high percentage of With-The-Rule.
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KEYWORD
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Corneal astigmatism, Anterior corneal astigmatism, Posterior corneal astigmatism, With-The-Rule
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