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Related Experiment Videos

The relation between corneal and total astigmatism

P R Keller1, M J Collins, L G Carney

  • 1Centre for Opthalmology and Visual Science, University of Western Australia, Perth, Australia.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|February 1, 1996
PubMed
Summary
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Computer-assisted videokeratoscopy confirms a linear relationship between corneal astigmatism and total ocular astigmatism. This finding holds true across various corneal zone diameters, supporting modified Javal

Area of Science:

  • Ophthalmology
  • Optometry
  • Corneal topography

Background:

  • Corneal astigmatism is a significant refractive error.
  • Accurate measurement of corneal astigmatism is crucial for vision correction.
  • Subjective refraction provides total ocular astigmatism, but corneal contribution is key.

Purpose of the Study:

  • To compare corneal astigmatism measurements from videokeratoscopy with total ocular astigmatism.
  • To analyze the relationship between corneal and total astigmatism across different corneal zone diameters.
  • To evaluate the validity of modified Javal's rule using videokeratoscopy data.

Main Methods:

  • Computer-assisted videokeratoscopy was used to measure corneal astigmatism.
  • Measurements were compared across a range of corneal zone diameters (2-7 mm).

Related Experiment Videos

  • Results were correlated with total ocular astigmatism obtained via subjective refraction.

    • Main Results:

    • A significant linear relationship was observed between corneal and total ocular astigmatism.
    • This linear correlation was consistent across all tested corneal aperture sizes.
    • The data supported modified Javal's rule with a slope of 1 and an intercept of approximately 0.50 D against-the-rule residual astigmatism.

    Conclusions:

    • Videokeratoscopy provides a detailed analysis of corneal power distribution.
    • The study validates the traditional view of a linear relationship between corneal and total astigmatism.
    • Modified Javal's rule accurately predicts the relationship, aiding in understanding residual astigmatism.