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9 July 2012 Anterior corneal asphericity calculated by the tangential radius of curvature
Jinglu Ying, Mingguang Shi, Bo Wang, Bo Wang
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Journal of Biomedical Optics, Vol. 17, Issue 7, 075005 (July 2012). https://doi.org/10.1117/1.JBO.17.7.075005
Abstract
We propose a method of calculating the corneal asphericity (Q) and analyze the characteristics of the anterior corneal shape using the tangential radius. Fifty-eight right eyes of 58 subjects were evaluated using the Orbscan II corneal topographer. The Q-values of the flat principal semi-meridians calculated by the sagittal radius were compared to those by the tangential radius. Variation in the Q-value with semi-meridian in the nasal and temporal cornea calculated by the tangential radius was analyzed. There were significant differences in Q-values (P<0.001) between the two methods. The mean Q-values of the flat principal semi-meridians calculated by tangential radius with −0.33±0.10 in the nasal and −0.22±0.12 in the temporal showed more negative than the corresponding Q-values calculated by the sagittal radius. The Q-values calculated by tangential radius became less negative gradually from horizontal semi-meridians to oblique semi-meridians in both nasal and temporal cornea. Variation in Q-value with semi-meridian was more obvious in the nasal cornea. The method of calculating corneal Q using the tangential radius could provide more reasonable and complete Q-value than that by the sagittal radius. The model of a whole anterior corneal surface could be reconstructed on the basis of the above method.
© 2012 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2012/$25.00 © 2012 SPIE
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Jinglu Ying, Mingguang Shi, Bo Wang, and Bo Wang "Anterior corneal asphericity calculated by the tangential radius of curvature," Journal of Biomedical Optics 17(7), 075005 (9 July 2012). https://doi.org/10.1117/1.JBO.17.7.075005
Published: 9 July 2012
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Cited by 14 scholarly publications.
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KEYWORDS
Cornea
Eye
Aspheric lenses
Refractor telescopes
Optical spheres
Shape analysis
Statistical analysis
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