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Abstract #5614 Published in IGR 2-1
Scanning laser polarimetry measurements after laser-assisted in situ keratomileusis
Gürses-Özden R; Pons ME; Barbiere C; Ishikawa H; Buxton DF; Liebmann JM; Ritch RAmerican Journal of Ophthalmology 2000; 129; 461-464
PURPOSE: To evaluate the effect of laser-assisted in situ keratomileusis on retinal nerve fiber layer thickness measurements obtained with scanning laser polarimetry. METHODS: Thirteen consecutive eyes (13 patients) undergoing laser-assisted in situ keratomileusis were enrolled in this prospective study. Scanning laser polarimetry (NFA-GDx, Laser Diagnostic Technologies, Inc., San Diego, CA) examination was performed one week before and one to eight weeks after laser-assisted in situ keratomileusis surgery. Intraocular pressure was normal at all preoperative and postoperative examinations. Total mean, and superior, temporal, inferior, and nasal mean retinal nerve fiber layer thickness values before and after laser-assisted in situ keratomileusis were compared by Student's paired t test. RESULTS: Mean ± SD patient age was 34.6±10.9 years (range, 20-56 years). Mean ± SD preoperative spherical equivalent refractive error was -6.6±3.1 diopters (range, -3.25 to -13.25 diopters), and mean ± SD spherical equivalent refractive surgical correction was -6.2±3.0 diopters (range, -2.9 to -12.25 diopters). Total mean retinal nerve fiber layer and superior, inferior, temporal, and nasal mean retinal nerve fiber layer thicknesses were thinner after laser-assisted in situ keratomileusis (p=0.01, for all comparisons, paired t test). CONCLUSIONS: Measurements of the retinal nerve fiber layer with scanning laser polarimetry depend on a corneal compensator inherent in the device. Keratorefractive surgery may affect scanning laser polarimetry measurements.
Dr. R. Ritch, Glaucoma Service, Department of Ophthalmology, The New York Eye and Ear Infirmary, 310 East 14th Street, New York, NY 10003, USA. rich@inx.net
Classification:
2.14 Optic disc (Part of: 2 Anatomical structures in glaucoma)
6.9.1 Laser scanning (Part of: 6 Clinical examination methods > 6.9 Computerized image analysis)
