PENTACAM STUDY OF ANTERIOR AND POSTERIOR CORNEAL ASTIGMATISM IN PATIENTS WITH KERATOCONUS AND HEALTHY CONTROLS | ||||
| Egyptian Journal of Clinical Ophthalmology | ||||
| Article 8, Volume 5, Issue 2, December 2022, Page 125-136 PDF (1.71 MB) | ||||
| Document Type: Original articles: include clinical trials, interventional research, Basic researches and clinically relevant laboratory investigations | ||||
| DOI: 10.21608/ejco.2022.280975 | ||||
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| Authors | ||||
| Marae, D.; Saad, S.; Riad, A.; Abdelazeem, K. | ||||
| Ophthalmology dept., Faculty of Medicine, Assiut Univ., Egypt | ||||
| Abstract | ||||
| Introduction: Keratoconus is a chronic, noninflammatory, progressive, ectatic corneal disorder that degrades vision due to myopia and irregular astigmatism. Recently, the priority of posterior corneal astigmatism has been identified when toric IOL is considered. The aim of the study was to assess and correlate the power and axis orientation of anterior and posterior corneal astigmatism in keratoconus patients and healthy controls. Patients and methods: This was a retrospective cross sectional comparative study which involve 100 eyes of 50 KC patients and 100 eyes of 50 control group. Which they have a scans of corneal tomography maps of goodquality that analyzed by pentacam. Results: The mean magnitudes of the ACA and PCA in KC group were higher than controls and the axis orientation of corneal astigmatism was 71% WTR for ACA and 73% ATR for PCA and there were significant correlations between ACA and PCA with TCA, the effect of ACA on TCA was 6.1% and of PCA on TCA was 9.2%. Conclusion: In KC magnitudes of the ACA and PCA were significantly higher than controls, and we found a significant correlation between the magnitudes of ACA, PCA to the magnitudes of TCA in both groups. The axis orientations of the ACA and PCA were WTR and ATR, respectively in most of KC cases. | ||||
| Keywords | ||||
| Keratoconus; Anterior corneal astigmatism; Posterior corneal astigmatism | ||||
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