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Spectral-domain OCT may reliably measure stromal bed thickness during LASIK
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Intraoperative spectral-domain OCT may be a reliable alternative to measure stromal bed thickness before lifting the flap during LASIK surgery, according to a study.
Stromal bed thickness was measured in 14 eyes during femtosecond LASIK using intraoperative SD-OCT and then swept-source OCT and ultrasound pachymetry. Three readings were obtained with each device to evaluate repeatability and agreement based on intraclass correlation coefficient and reproducibility coefficient.
Stromal bed thickness measurements obtained with all three devices were highly repeatable, with intraclass correlation coefficients no less than 0.98 and reproducibility coefficients no more than 8.7 µm.
SD-OCT and SS-OCT had good agreement of measurements, but both OCT devices underestimated stromal bed thickness values compared with ultrasound pachymetry.
“We believe that based on the results of our study, the LASIK [stromal bed thickness] can be reliably measured with an intraoperative SD-OCT before lifting the flap,” the study authors said. “Ultrasound remains a reliable and cheaper alternative to intraoperative OCT. However, clinicians should be aware that the OCT underestimates [stromal bed thickness] measurements relative to values obtained with ultrasound.” – by Kristie L. Kahl
Disclosure: The authors report no relevant financial disclosures.
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