Comprehensive Evaluation of Anterior Corneal Change in Asphericity Calculated by the Tangential Radius of Curvature after LASIK
Joint Authors
Ying, Jinglu
Cai, Jianqiu
Zhu, Leru
Zha, Yi
Source
Issue
Vol. 2017, Issue 2017 (31 Dec. 2017), pp.1-8, 8 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2017-02-06
Country of Publication
Egypt
No. of Pages
8
Main Subjects
Abstract EN
To evaluate the change in the anterior corneal asphericity (ΔQ) comprehensively calculated using the tangential radius (rt) after LASIK.
Forty-two right eyes were evaluated using the Orbscan II corneal topographer.
The pre- and postoperative Q-values of the flat principal semimeridians calculated by the sagittal radius were compared to those by the tangential radius.
The Q-value of each semimeridian in the horizontal region was calculated by rt.
Fourier fitting was used to model the 360-semimeridional variation of Q-values and to fit the Q-values in the vertical region before and after surgery.
There were significant differences in Q-values between the two methods before (P<0.001) and after surgery (P=0.003).
A significant increase in postoperative Q-value was detected compared to preoperative Q-value (P<0.001) calculated by rt.
The 360-semimeridional variation of the Q-values was well fitted with a third- and fourth-degree Fourier function before and after surgery.
The ΔQ-value distribution presented double valley variation, with the amount of ΔQ being lowest in the near-vertical regions and highest in the near-horizontal regions.
Calculating the Q-value with rt combined with Fourier fitting, we evaluated 360 ΔQ-values’ variation of semimeridians of the entire anterior corneal surface and then displayed true and complete anterior corneal shape after LASIK.
American Psychological Association (APA)
Ying, Jinglu& Cai, Jianqiu& Zhu, Leru& Zha, Yi. 2017. Comprehensive Evaluation of Anterior Corneal Change in Asphericity Calculated by the Tangential Radius of Curvature after LASIK. Journal of Ophthalmology،Vol. 2017, no. 2017, pp.1-8.
https://search.emarefa.net/detail/BIM-1184851
Modern Language Association (MLA)
Ying, Jinglu…[et al.]. Comprehensive Evaluation of Anterior Corneal Change in Asphericity Calculated by the Tangential Radius of Curvature after LASIK. Journal of Ophthalmology No. 2017 (2017), pp.1-8.
https://search.emarefa.net/detail/BIM-1184851
American Medical Association (AMA)
Ying, Jinglu& Cai, Jianqiu& Zhu, Leru& Zha, Yi. Comprehensive Evaluation of Anterior Corneal Change in Asphericity Calculated by the Tangential Radius of Curvature after LASIK. Journal of Ophthalmology. 2017. Vol. 2017, no. 2017, pp.1-8.
https://search.emarefa.net/detail/BIM-1184851
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1184851