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Randomized study of single vs double exposure in myopic PRK
A Scialdone1, F Carones, A Bertuzzi
1Departement of Ophthalmology, University of Milan, Scientific Institute HS, Italy.
Refractive & Corneal Surgery
|March 1, 1993
Summary
Multizone photorefractive keratectomy (PRK) offers a safe method for correcting high myopia. This technique divides the laser ablation into multiple zones, reducing treatment depth without compromising refractive outcomes or increasing complications.
Area of Science:
- Ophthalmology
- Refractive Surgery
- Corneal Surgery
Background:
- High myopia presents challenges for refractive correction.
- Standard photorefractive keratectomy (PRK) can involve significant ablation depth for high myopic corrections.
- Multizone PRK aims to improve predictability and safety by altering the ablation profile.
Purpose of the Study:
- To compare the efficacy and safety of single-zone versus double-zone PRK for high myopia correction.
- To evaluate the predictability and complication rates of multizone PRK in patients with high myopia.
Main Methods:
- A randomized study involving 24 eyes with high myopia (refractions between -6.00 D and -9.00 D).
- Eyes were randomized to receive either single-zone or double-zone PRK.
- Patient outcomes were assessed at 1 year post-surgery.
Main Results:
- No significant differences in refractive outcomes were observed between single-zone and double-zone PRK at the 1-year follow-up.
- Complication rates were comparable between the two treatment groups.
- Multizone PRK successfully reduced the maximum central ablation depth.
Conclusions:
- Multizone PRK is a safe and effective technique for correcting high myopia.
- The technique allows for a smoother ablation profile and reduced keratectomy depth.
- It enhances the predictability of high myopic corrections without adverse effects.