Scanning laser polarimetry in corneal topographic changes after photorefractive keratectomy

To examine whether, or not, corneal topographic changes after excimer laser photorefractive keratectomy (PRK) for myopia and myopic astigmatism have any influence on measurements of the retinal nerve fiber layer (NFL) with scanning laser polarimetry. Retinal NFL thicknesses were determined by scanni...

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Bibliographic Details
Published in:International ophthalmology 1998, Vol.22 (2), p.113-117
Main Authors: Ozdek, S, Onol, M, Bilgihan, K, Akata, F, Hasanreisoğlu, B
Format: Article
Language:English
Subjects:
Adult
Astigmatism - surgery
Corneal Topography
Diagnostic Techniques, Ophthalmological
Follow-Up Studies
Humans
Lasers
Lasers, Excimer
Myopia - surgery
Nerve Fibers
Optic Nerve - anatomy & histology
Photorefractive Keratectomy
Prospective Studies
Reproducibility of Results
Sensitivity and Specificity
Visual Acuity
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Summary:To examine whether, or not, corneal topographic changes after excimer laser photorefractive keratectomy (PRK) for myopia and myopic astigmatism have any influence on measurements of the retinal nerve fiber layer (NFL) with scanning laser polarimetry. Retinal NFL thicknesses were determined by scanning laser polarimetry in 17 eyes of 13 patients with myopia and myopic astigmatism before and after PRK. Total ablation depth ranged from 26 to 71 microm. We used the relative ratios for superior and inferior NFL thicknesses which were calculated by dividing the NFL values of respective regions by the nasal value. The mean superior NFL ratio measured was 3.02 +/- 0.92 preoperatively, and 3.00 +/- 0.76 postoperatively. The mean inferior NFL ratio was 2.95 +/- 0.75 preoperatively, and 2.99 +/- 0.66 postoperatively. There was no statistically significant difference between preoperative and postoperative NFL measurements (Wilcoxon signed rank test, p > 0.05). Corneal topographic changes after PRK have no significant influence on NFL measurements by scanning laser polarimetry. Our results suggest that scanning laser polarimetry can be used as a reliable method for retinal NFL thickness measurements even after excimer laser PRK.
ISSN:0165-5701
DOI:10.1023/A:1006205718134