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Related Experiment Videos

Excimer laser ablation rate and corneal hydration

P J Dougherty1, K L Wellish, R K Maloney

  • 1Jules Stein Eye Institute, Los Angeles, CA 90024-7003.

American Journal of Ophthalmology
|August 15, 1994
PubMed
Summary

Corneal hydration significantly impacts excimer laser ablation rates. Minimizing dehydration during photorefractive keratectomy is crucial for accurate myopia correction and predictable outcomes.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Laser Surgery

Background:

  • Excimer laser photorefractive keratectomy (PRK) involves removing corneal epithelium, initiating dehydration.
  • Corneal hydration levels may influence the excimer laser ablation rate, potentially affecting refractive correction accuracy.

Purpose of the Study:

  • To investigate the effect of corneal hydration on excimer laser ablation rates in bovine eyes.
  • To determine how hydration changes influence both hydrated tissue and dry component ablation rates.

Main Methods:

  • Bovine corneoscleral rims were hydrated using varying dextran solutions.
  • Laser ablation was performed on corneal buttons, and mass removed was measured.
  • Hydrated tissue and dry component ablation rates were calculated based on mass loss.

Main Results:

  • The hydrated tissue ablation rate increased with corneal hydration (5.6 µg/cm²/pulse per unit increase).
  • Conversely, the dry component ablation rate decreased linearly with increased hydration (-0.82 µg/cm²/pulse per unit increase).
  • Physiologic hydration showed a hydrated tissue ablation rate of 0.40 µm/pulse.

Conclusions:

  • The dry component ablation rate, which increases with corneal dehydration, is critical for refractive outcomes in PRK.
  • Significant corneal dehydration before ablation may lead to myopic overcorrection.
  • Techniques minimizing hydration changes are recommended for maximizing PRK predictability.

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