Asymmetry of Central and Peipheral Corneal Astigmatism Measured by Photokeratoscopy
作者:
DAVID SCHULTZ,
期刊:
American Journal of Optometry and Physiological Optics
(OVID Available online 1977)
卷期:
Volume 54,
issue 11
页码: 776-781
ISSN:0093-7002
年代: 1977
出版商: OVID
关键词: corneal astigmatism;asymmetric;irregular;photokeratoscopy;measurement;central cornea;peripheral cornea
数据来源: OVID
摘要:
The radii of curvature of 10 astigmatic corneas (1.125 to 3.625 D) were measured by photokeratoscopy in 4 semimeridians: 2 axis semimeridians and 2 power semimeridians. Most of the angular separations between adjacent semimeridians differed from 90 deg by more than 2.5 deg; the separations ranged from 55 to 120 deg. Corneal astigmatism, as specified by the difference in curvature between adjacent axis and power semimeridians at corresponding distances from the corneal apex, was also highly asymmetric with decreasing astigmatism in the corneal periphery. An interesting revelation was the interchange of the axis and power semimeridians in the periphery of 3 subjects' corneas.
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