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Axial length in keratoconus.

J D Lanier1, R H Bullington, T C Prager

  • 1Department of Ophthalmology, University of Texas, Houston 77025.

Cornea
|May 11, 1992
PubMed
Summary
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Axial length in keratoconus eyes is similar to emmetropic eyes. A smaller donor trephine in penetrating keratoplasty significantly reduces axial length, potentially mitigating myopia.

Area of Science:

  • Ophthalmology
  • Refractive Surgery
  • Corneal Diseases

Background:

  • Axial length is a key factor in ocular refractive power.
  • Established axial length norms are lacking for keratoconus eyes.

Purpose of the Study:

  • Determine axial length mean and range in untreated keratoconus and post-keratoplasty eyes.
  • Assess axial length reduction after penetrating keratoplasty with varying surgical techniques.

Main Methods:

  • Applanation ultrasonography used to measure axial length.
  • 157 untreated keratoconus eyes and 66 post-keratoplasty eyes studied.

Main Results:

  • Mean axial length for untreated keratoconus: 24.39 mm (range 21.82-28.69 mm).

Related Experiment Videos

  • Mean axial length for post-keratoplasty: 24.10 mm (range 21.83-26.87 mm).
  • Significantly reduced axial length observed when donor trephine was 0.3 mm smaller than recipient trephine (p=0.04).

    • Conclusions:

    • Axial length in keratoconus eyes is comparable to emmetropic eyes.
    • Surgical technique, specifically trephine size difference, impacts axial length post-keratoplasty.
    • Axial length is crucial for predicting refractive outcomes and managing postoperative myopia.