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Related Experiment Videos

Management of irregular astigmatism.

M Goggin1, N Alpins, L M Schmid

  • 1University of Adelaide, Queen Elizabeth Hospital, Australia.

Current Opinion in Ophthalmology
|September 8, 2000
PubMed
Summary

Modern videokeratoscopy may identify significant primary irregular astigmatism in normal corneas. Treatment advances, including laser ablations, aim to optimize the eye's optical surface, but systematic approaches are still debated.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Corneal Science

Background:

  • Corneal irregularity, including primary irregular astigmatism, is prevalent, with videokeratoscopy identifying it in approximately 40% of normal corneas with toric refractive error.
  • Secondary irregular astigmatism arises from various factors such as corneal surgery, trauma, dystrophies, and infections.
  • Noncorneal astigmatism, including lenticular astigmatism, also contributes to the overall refractive irregularity of the eye.

Purpose of the Study:

  • To review the current understanding and management of irregular astigmatism.
  • To discuss the evolving treatment options, particularly excimer laser ablations.
  • To explore the integration of diagnostic technologies for optimal refractive outcomes.

Main Methods:

Related Experiment Videos

  • Review of current literature on corneal irregularity and astigmatism.
  • Analysis of videokeratoscopy findings in normal and irregular corneas.
  • Discussion of advanced diagnostic and treatment technologies, including topographic analysis, wavefront analysis, and vector planning.

    • Main Results:

    • Videokeratoscopy may overestimate primary irregular astigmatism in normal corneas.
    • Tailored corneal excimer laser ablations offer improved treatment options.
    • The optimal corneal shape and systematic treatment approaches remain subjects of ongoing discussion.

    Conclusions:

    • Integrated use of topographic analysis, wavefront analysis, and vector planning is crucial for refining refractive techniques.
    • Ablatable polymer techniques show potential for managing irregularly roughened corneas.
    • Further research is needed to establish definitive systematic approaches for optimizing the ocular optical surface.