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Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile
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Published on: September 20, 2024

Orthoptic Changes following Photorefractive Keratectomy.

Zhale Rajavi1, Nader Nassiri, Monir Azizzadeh

  • 1Ophthalmic Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.

Journal of Ophthalmic & Vision Research
|March 29, 2012
PubMed
Summary

Photorefractive keratectomy (PRK) can alter orthoptic measurements. While some pre-existing strabismus may improve, new deviations and changes in convergence, divergence, and stereopsis can occur post-PRK.

Keywords:
Orthoptic ChangesPhotorefractive KeratectomyStrabismus

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Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Photorefractive keratectomy (PRK) is a common refractive surgery.
  • Understanding its impact on binocular vision is crucial for patient outcomes.

Purpose of the Study:

  • To evaluate orthoptic changes following photorefractive keratectomy (PRK).

Main Methods:

  • An interventional case series involving 297 eyes from 150 patients undergoing PRK.
  • Comprehensive ophthalmologic and orthoptic examinations were conducted preoperatively and three months postoperatively.

Main Results:

  • Preexisting esotropia remained unchanged; exotropia improved in some cases.
  • New-onset near exotropia developed in 4% of patients, and 2% became orthophoric.
  • Significant reductions in convergence and divergence amplitudes and increased near point of convergence (NPC) were observed post-PRK.

Conclusions:

  • PRK can lead to improvements or no change in existing strabismus, but new deviations may arise.
  • Post-PRK changes include decreased fusional amplitudes, increased NPC, and potential stereopsis improvement.
  • Preoperative orthoptic assessment is recommended to identify patients at risk for these changes.