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Related Experiment Videos

Treating keratoconus with intacs corneal ring segments.

Timo Hellstedt1, Janna Mäkelä, Raimo Uusitalo

  • 1Helsinki University Eye Hospital, Helsinki and Jorvi, Finland.

Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|June 28, 2005
PubMed
Summary

Intacs inserts safely and effectively treat mild to moderate keratoconus, improving vision and reducing astigmatism. While vision outcomes are positive, the exact change in astigmatism correction remains unpredictable.

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Area of Science:

  • Ophthalmology
  • Corneal Surgery
  • Vision Science

Background:

  • Keratoconus is a progressive thinning of the cornea, leading to irregular astigmatism and reduced visual acuity.
  • Current treatments for mild to moderate keratoconus aim to improve visual function and slow disease progression.

Purpose of the Study:

  • To evaluate the safety and efficacy of Intacs inserts for treating mild to moderate keratoconus.
  • To assess visual acuity, refractive changes, and patient satisfaction following Intacs implantation.

Main Methods:

  • A prospective, nonrandomized clinical trial involving 50 eyes of 37 patients with mild to moderate keratoconus.
  • Patients received asymmetrical Intacs segments, with outcomes measured preoperatively and up to 12 months postoperatively.
  • Key outcome measures included uncorrected visual acuity (UCVA), best spectacle-corrected visual acuity (BSCVA), and corneal astigmatism.

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Main Results:

  • 92% of Intacs surgeries were successful, with a mean follow-up of 6.3 months.
  • Significant improvements were observed in both BSCVA and UCVA.
  • Patient satisfaction increased from 24.3% to 87.5% at 12 months, with visual functioning scores also improving.

Conclusions:

  • Asymmetric Intacs placement is a safe and effective procedure for mild to moderate keratoconus.
  • Intacs implantation leads to improved visual acuity and reduced astigmatism.
  • The degree of astigmatism correction achieved with Intacs is unpredictable.