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Related Experiment Videos

Hyperopic thermokeratoplasty: clinical evaluation.

A C Neumann1, D Sanders, M Raanan

  • 1Neumann Eye Institute, DeLand, Florida.

Journal of Cataract and Refractive Surgery
|November 1, 1991
PubMed
Summary

Hyperopic thermokeratoplasty (HTK) initially reduced hyperopia significantly but showed substantial regression over time. Most patients experienced undercorrection within six months, indicating limited long-term effectiveness for hyperopia correction.

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Area of Science:

  • Ophthalmology
  • Refractive Surgery
  • Corneal Surgery

Background:

  • Hyperopic thermokeratoplasty (HTK) is a Soviet-developed procedure for hyperopia correction.
  • It utilizes controlled thermal burns on the corneal stroma.
  • The technique aims to flatten the peripheral cornea and steepen the central cornea.

Purpose of the Study:

  • To prospectively evaluate the refractive outcomes of hyperopic thermokeratoplasty (HTK).
  • To assess the efficacy and stability of HTK in correcting hyperopia.

Main Methods:

  • Prospective evaluation of 61 patients undergoing HTK.
  • Application of radial thermal coagulations to the peripheral cornea.
  • Titration of effect by varying optical zone and number of rays.

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Main Results:

  • Initial mean hyperopia of 3.9 D reduced by 6.0 D one day post-surgery.
  • Significant regression observed between one day and two months, approaching emmetropia.
  • Progressive regression continued, with 63% undercorrected by six months and 83% by one year.
  • Smaller optical zones resulted in greater overall refractive change.

Conclusions:

  • HTK provides an initial reduction in hyperopia.
  • The refractive effect of HTK is unstable, with significant regression over time.
  • Long-term undercorrection is common, questioning the sustained efficacy of HTK for hyperopia.