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Abstract #20343 Published in IGR 10-1
The comparative study of two recently developed A-scan devices: determination of central corneal thickness, anterior chamber depth and axial length
Sohajda Z; Papp J; Berta A; Módis LActa Ophthalmologica Scandinavica 2008; 86: 45-48
PURPOSE: The clinical use and comparison of two recently developed A-scan ultrasound devices. METHODS: The same investigator determined central corneal thickness (CCT), anterior chamber depth (ACD) and axial length (AL) with an OcuScan RxP (Alcon, Forth Worth, Texas, USA) and an AL-2000 (Tomey, Erlangen, Germany) ultrasound device in 80 eyes of 40 patients. The mean patient age was 63.72 years [standard deviation (SD) 18.92]. The patients did not suffer from any systemic or eye disease affecting the anterior and posterior segments of the eye, and their refractive error (spherical and astigmatic) did not exceed ± 3.0 dioptres. RESULTS: The value of the CCT was 541.55 (SD 34.97) μm with the OcuScan RxP, and 547.46 (SD 35.70) μm with the AL-2000 device (P < 0.001). With respect to the ACD and AL, significantly lower values were obtained with the AL-2000 instrument (P < 0.001). The ACD was 2.92 (SD 0.48) mm with the AL-2000 and 3.07 (SD 0.47) mm with the OcuScan RxP device. The AL was 22.67 (SD 0.84) mm with the AL-2000 and 22.81 (SD 0.87) mm with the OcuScan RxP instrument. However, a positive and significant correlation could be demonstrated between the devices (r = 0.88 CCT, r = 0.86 ACD and r = 0.91 AL; P < 0.001). CONCLUSION: The instruments are reliable in clinical use; however, statistically significant differences were found between the devices. During patient follow-up, the devices cannot simply be used interchangeably.
Dr. Z. Sohajda, Department of Ophthalmology, Medical and Health Science Centre, University of Debrecen, Hungary. zoltansohajda@hotmail.com
Classification:
6.12 Ultrasonography and ultrasound biomicroscopy (Part of: 6 Clinical examination methods)
2.2 Cornea (Part of: 2 Anatomical structures in glaucoma)
9.3.4 Primary angle closure suspect (Part of: 9 Clinical forms of glaucomas > 9.3 Primary angle closure glaucomas)