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Astigmatic change after myopic spherical excimer PRK
1Department of Ophthalmology, University of Brussels, Belgium.
Bulletin De La Societe Belge D'Ophtalmologie
|January 1, 1997
Summary
Photorefractive keratectomy (PRK) can induce astigmatism, particularly with deeper treatments. However, induced astigmatism may spontaneously regress if the PRK procedure is decentered.
Area of Science:
- Ophthalmology
- Refractive Surgery
Background:
- Spherical photorefractive keratectomy (PRK) is a common refractive surgery.
- Understanding induced astigmatism after PRK is crucial for patient outcomes.
Purpose of the Study:
- To evaluate the development and potential regression of induced astigmatism after spherical PRK.
- To identify factors correlating with induced astigmatism post-PRK.
Main Methods:
- Retrospective analysis of 85 patients undergoing spherical PRK.
- Average follow-up period of 1 year.
- Measurement of induced and pre-existent astigmatism.
Main Results:
- An average induced astigmatism of 0.58 diopters was observed after 1 year.
- A correlation was found between induced astigmatism and PRK treatment depth.
- No significant correlation was observed between induced astigmatism and pre-existent astigmatism.
- Spontaneous regression of induced astigmatism was noted in cases of decentered PRK.
Conclusions:
- PRK-induced astigmatism is influenced by treatment depth.
- Decentered PRK may lead to spontaneous regression of induced astigmatism.
- Further research into PRK parameters and astigmatism is warranted.