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    The asphericity, curvature and tilt of the human cornea measured using a videokeratoscope

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    Publication date
    2003
    Author
    Douthwaite, William A.
    Keyword
    Apical Radius
    Tilt
    Corneal Asphericity
    Videokeratoscope
    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    The EyeSys videokeratoscope (VK) measurements of the principal corneal meridians of 98 subjects already analysed by Douthwaite et al. [Ophthal. Physiol. Opt. (1999)19:467¿474] were re-analysed in order to revise the assessment of asphericity, to derive information on corneal tilt and to assess the degree to which the corneal section approximates to that of a conic section. The range of normality for the revised p-value (asphericity) was from 0.57 to 0.97 for the near horizontal and from 0.56 to 1.08 in the near vertical principal meridians. The approximate corneal tilt angles ranged from ¿3.95 to +8.13 degrees in the horizontal and from ¿8.99 to +9.33 degrees in the vertical meridian. A tilted conicoidal surface will display a linear relationship (r = 1) when a scatterplot is drawn of the perpendicular distance squared vs radius squared, after first averaging the two semimeridian results for each VK ring. Analysing the results from the human cornea in the same way allows an assessment of the degree to which the corneal section approximates to that of the conic section.
    URI
    http://hdl.handle.net/10454/4162
    Version
    No full-text available in the repository
    Citation
    Douthwaite, W.A. (2003). The asphericity, curvature and tilt of the human cornea measured using a videokeratoscope. Ophthalmic and Physiological Optics. Vol. 23, No. 2, pp. 141-150.
    Link to publisher’s version
    http://dx.doi.org/10.1046/j.1475-1313.2003.00100.x
    Type
    Article
    Collections
    Life Sciences Publications

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