Evaluación de la reproducibilidad en la medición del grosor corneal central con el paquímetro de reflectometría óptica de baja coherencia y comparación con el paquímetro ultrasónico en sujetos sanos
| Autor: | Andrés Villarreal-González, Eduardo Plancarte-Lozano, Agustín Del Valle-Penella, Manuel Garza-León, María de Lourdes Guzmán-Martínez |
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| Rok vydání: | 2019 |
| Předmět: |
Keratoconus
Reproducibility medicine.medical_specialty medicine.diagnostic_test Intraclass correlation business.industry medicine.medical_treatment Coefficient of variation Repeatability medicine.disease Standard deviation Refractive surgery Ophthalmology medicine Surgery Corneal pachymetry business |
| Zdroj: | Cirugía y Cirujanos. 86 |
| ISSN: | 0009-7411 |
| DOI: | 10.24875/ciru.m18000002 |
| Popis: | Background Corneal pachymetry is widely used for refractive surgery and follow up in keratoconus, accurate measurement is essential for a safe surgery. Objective To assess intraobserver reliability of central corneal thickness (CCT) measurements using optical low-coherence reflectometry (OLCR) technology and its agreement with ultrasonic pachymeter (US). Method Randomized and prospective comparative evaluation of diagnostic technology. One randomly healthy eye of subjects was scanned three times with both devices. Intraobserver within-subject standard deviation (Sw), coefficient of variation (CVw) and intraclass correlation coefficient (ICC) were obtained for reliability analysis; for study agreement, data were analyzed using the paired-sample t test and the Bland-Altman LoA method. The mean of three scans of each equipment was used to assess the LoA. Results The study enrolled 30 eyes of 30 subjects with average age of 28.70 ± 8.06 years. For repeatability, the Sw were 3.41 and 5.96 µ, the intraobserver CVw was 2 and 4% and ICC 0.991 and 0.988, for OLCR and US respectively. The mean CCT difference between OLCR and US was 8.90 ± 9.03 µ (95% confidence interval: 5.52-2.27 µ), and the LoA was 35.40 µ. Conclusions OLCR technology provided reliable intraobserver CCT measurements. Both pachymetry measurements may be used interchangeably with minimum calibration adjustment. |
| Databáze: | OpenAIRE |
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