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Posterior corneal topographic changes after retreatment LASIK.
Alka Rani1, Balasubramanya R Murthy, Namrata Sharma
1Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India.
Ophthalmology
|November 5, 2002
Summary
Repeat LASIK retreatment can increase posterior corneal elevation. Eyes with prior posterior corneal elevation increases and thinner corneas are more susceptible to these changes after repeat laser vision correction.
Area of Science:
- Ophthalmology
- Corneal Surgery
- Refractive Surgery
Background:
- Laser in situ keratomileusis (LASIK) is a common procedure for myopia correction.
- Repeat LASIK may be performed to address residual refractive error.
- Understanding corneal changes after repeat LASIK is crucial for patient safety and outcomes.
Purpose of the Study:
- To evaluate posterior corneal topographic changes following retreatment for residual myopia after primary LASIK.
- To identify factors influencing posterior corneal elevation changes after repeat LASIK.
Main Methods:
- A retrospective study analyzed 33 eyes of 23 patients undergoing repeat LASIK.
- Slit-scanning corneal topography was used to assess posterior corneal changes pre- and post-retreatment.
- Correlations were made between posterior corneal elevation and pachymetry, residual bed thickness, and ablation depth.
Main Results:
- Posterior corneal elevation increased after repeat LASIK, significantly correlated with preoperative central pachymetry.
- Factors influencing elevation after primary LASIK included attempted correction and residual bed thickness.
- Eyes with higher posterior corneal elevation post-repeat LASIK had thinner corneas and lower residual bed thickness.
- Preoperative central pachymetry and prior posterior corneal elevation were significant determinants of elevation increase after repeat LASIK.
Conclusions:
- Repeat LASIK is associated with an increase in posterior corneal elevation.
- Eyes with pre-existing posterior corneal elevation changes and thinner corneas are at higher risk for increased posterior elevation after repeat LASIK.