The Relation Between Corneal and Total Astigmatism

Keller, Peter R., Collins, Michael J., Carney, Leo G., Davis, Brett A., & Van Saarloos, Paul P. (1996) The Relation Between Corneal and Total Astigmatism. Optometry and Vision Science, 73(2), pp. 86-91.



Using computer-assisted videokeratoscopy we measured corneal astigmatism and compared these results over a range of corneal zone diameters with total ocular astigmatism derived by subjective refraction. Videokeratoscopes permit a more detailed analysis of the power distribution within a given corneal surface area, enabling comparison to the total astigmatism for equivalent aperture sizes. Although there were significant individual variations, the group average data supports the traditional view of a linear relation between corneal and total astigmatism. This was true across the range of apertures tested from 2 to 7 mm, with the coordinates of the relation being consistent with that of the modified Javal's rule; namely a slope of 1 and an intercept of approximately 0.50 D against-the-rule residual astigmatism.

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ID Code: 3215
Item Type: Journal Article
Refereed: Yes
Additional Information:
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Keywords: Image Processing, Computer, Assisted, Astigmatism/, physiopathology, Cornea/, physiopathology, Adult, Astigmatism/pathology, Comparative Study, Cornea/pathology, Female, Humans, Male, Microscopy, Video, Refraction, Ocular, Regression Analysis, Research Support, Non, U, S, Gov't
ISSN: 1040-5488
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 1996 American Academy of Optometry
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 24 Jan 2006 00:00
Last Modified: 21 Mar 2016 06:25

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