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Intacs for keratoconus.

Brian S Boxer Wachler1, Jonathan P Christie, Naveen S Chandra

  • 1Boxer Wachler Vision Institute, Beverly Hills, CA 90210, USA. bbw@boxerwachler.com

Ophthalmology
|May 17, 2003
PubMed
Summary
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Intacs implantation improved vision and reduced astigmatism in keratoconus patients. This study evaluated the safety and efficacy of Intacs for keratoconus, showing significant visual acuity gains.

Area of Science:

  • Ophthalmology
  • Corneal Surgery
  • Vision Science

Background:

  • Keratoconus is a progressive thinning and ectasia of the cornea.
  • Intrastromal corneal ring segments (Intacs) are used to flatten and regularize the corneal shape.
  • Evaluating Intacs' efficacy and safety is crucial for managing keratoconus.

Purpose of the Study:

  • To assess the efficacy and safety of Intacs implantation for treating keratoconus.
  • To evaluate the impact of Intacs on visual acuity and corneal astigmatism.

Main Methods:

  • A retrospective, nonrandomized comparative trial involving 74 eyes of 50 keratoconus patients.
  • Modified Intacs implantation with asymmetric ring placement based on pachymetry and a refractive nomogram.
  • Preoperative and postoperative visual acuity, spherical equivalent, and keratometric measurements were analyzed.

Related Experiment Videos

Main Results:

  • Best spectacle-corrected visual acuity improved by 2 lines (LogMAR 0.41 to 0.24).
  • Uncorrected visual acuity improved by 4 lines (LogMAR 1.05 to 0.61).
  • Mean spherical equivalent improved from -3.89 D to -1.46 D, indicating reduced myopia and astigmatism.

Conclusions:

  • Asymmetric Intacs implantation effectively improves uncorrected and best spectacle-corrected visual acuity in keratoconus patients.
  • The procedure also successfully reduces irregular astigmatism, even in corneas with scarring.
  • Intacs offer a viable surgical option for keratoconus management.