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Erschienen in:
02.11.2017 | Basic Science
Repeatability assessment of anterior segment biometric measurements under accommodative and nonaccommodative conditions using an anterior segment OCT
Erschienen in: Graefe's Archive for Clinical and Experimental Ophthalmology | Ausgabe 1/2018
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Purpose
As accommodation is a dynamic process changing anterior ocular structures, we aim to compare the repeatability between the biometric measurements taken with and without accommodation.
Methods
Thirty healthy right eyes were measured in a baseline and an accommodative state using Visante-OCT. Three repeated measurements were taken to obtain central corneal thickness (CCT), anterior chamber depth (ACD), angle-to-angle distance (ATA), iridocorneal angles (IA), and crystalline lens thickness (LT). Repeatability was evaluated by the calculation of coefficient of repeatability (CoR), coefficient of variation (CoV), and intraclass correlation coefficient (ICC). In addition, the Passing–Bablok regression method was applied.
Results
For the nonaccommodative state, the CoR for CCT, ACD, ATA, and LT was 20.02 μm, 0.09 mm, 0.25 mm, and 0.12 mm respectively. The CoR for CCT, ACD, ATA, and LT in the 6D–accommodative state was 20.85 μm, 0.08 mm, 0.26 mm, and 0.14 mm respectively. IA had similar results for both states; the CoR ranged between 3 and 4°, CoV was less than 4%, and the ICC was between 0.984–0.988. There were no significant differences between the three repeated measurements for any measurement.
Conclusions
Visante-OCT provides good repeatability for anterior segment measurements for both accommodative and nonaccommodative states.