Abstract | PURPOSE: DESIGN: Retrospective case series. METHODS: This study comprised 137 eyes of 137 keratoconic patients (97 men and 40 women; mean age ± standard deviation, 36.9 ± 12.2 years). The magnitude and the axis orientation of each corneal astigmatism were determined with a rotating Scheimpflug system. RESULTS: The mean magnitudes of anterior, posterior, and total central corneal astigmatism were 3.93 ± 2.74 diopters (D), 0.93 ± 0.64 D, and 3.90 ± 2.75 D, respectively. With-the-rule (WTR), against-the-rule (ATR), and oblique astigmatism of the anterior corneal surface was found in 90 eyes (65.7%), 33 eyes (24.1%), and 14 eyes (10.2%), respectively, whereas the corresponding astigmatism of the posterior corneal surface was found in 14 eyes (10.2%), 15 eyes (10.9%), and 108 eyes (78.8%), respectively. We found a significant correlation between the magnitudes of anterior and posterior corneal astigmatism (Pearson correlation coefficient r = 0.769, P < .001). CONCLUSIONS:
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Authors | Kazutaka Kamiya, Kimiya Shimizu, Akihito Igarashi, Toshiyuki Miyake |
Journal | American journal of ophthalmology
(Am J Ophthalmol)
Vol. 160
Issue 5
Pg. 851-857.e1
(Nov 2015)
ISSN: 1879-1891 [Electronic] United States |
PMID | 26299537
(Publication Type: Journal Article)
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Copyright | Copyright © 2015 Elsevier Inc. All rights reserved. |
Topics |
- Adolescent
- Adult
- Aged
- Astigmatism
(diagnosis, etiology)
- Cornea
(pathology)
- Corneal Topography
(methods)
- Female
- Humans
- Keratoconus
(complications, diagnosis)
- Male
- Middle Aged
- Refraction, Ocular
(physiology)
- Retrospective Studies
- Visual Acuity
- Young Adult
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