Anterior segment biometry using ultrasound biomicroscopy versus Artemis-2 Very-high-frequency ultrasound scanning on normal subjects.
Journal Article
AlMutairi, Haya M Al-Farhan and Reem N . 2013
نوع عمل المنشور:
article
رابط المنشور على الويب:
المجلة \ الصحيفة:
Clincal Ophthalmol
رقم العدد:
25
رقم الإصدار السنوي:
7
الصفحات:
141-147
مستخلص المنشور:
Purpose
To compare the precision of anterior chamber angle (ACA) and anterior chamber depth (ACD) measurements taken with ultrasound biomicroscopy (UBM) and the Artemis-2 Very High Frequency Ultrasound Scanner (VHFUS) in normal subjects.
Design
Prospective study.
Methods
We randomly selected one eye from each of 59 normal subjects in this study. Two subjects dropped out of the study; the associated data were excluded from analysis. ACA and ACD measurements were obtained using the VHFUS and the UBM. The results were compared statistically using repeated-measures analysis of variance for the intraobserver repeatability, unpaired t-test, and limits of agreement.
Results
The average ACA values for the UBM and the VHFUS (±standard deviation) were 41.83° ± 5.03° and 33.36° ± 6.03°, respectively. The average ACD values were 2.96 ± 0.34 mm and 2.87 ± 0.31 mm. The intraobserver repeatability analysis of variance P-values for ACA and ACD measurements using UBM were 0.10 and 0.68, respectively; for the Artemis-2 VHFUS, the respective values were 0.68 and 0.09. The difference in ACA measurements was statistically significant (t = 8.41; P < 0.0001), while the difference in ACD values was not (t = 1.51; P < 0.13). The mean ACA difference was 8.50° ± 2.50°, and the limits of agreement were +13.30° to −3.60°. The mean ACD difference was 0.09 ± 0.27 mm, and the limits of agreement ranged from 0.61 mm to −0.43 mm. The mean difference percentage of ACD was 3.1% for both instruments.
Conclusion
In case of the ACD, both instruments can be used interchangeably; however, with the ACA instruments, they cannot be used interchangeably.
Keywords: anterior chamber angle, anterior chamber depth, Artemis-2 VHF scanner, ultrasound biomicroscope, normal eyes