Axial Length Measurement: PalmScan Versus IOLMaster

作者：Lipson Michael J^*

来源：Eye and Contact Lens: Science and Clinical Practice , 2015, 41(3): 156-159.

DOI：10.1097/ICL.0000000000000140

• Axial length
• Biometry
• IOLMaster
• PalmScan

Objective: To compare axial length measurements taken on the handheld Micro Medical Devices (MMD) PalmScan with those taken with the Carl Zeiss Meditec IOLMaster.
Methods: Sixty subjects had IOLMaster performed by a single operator to measure axial length in both eyes. Subjects then had axial length measurements taken by a different single operator with the MMD device. Each operator was masked to the other's results. Independent statistical analysis was performed to compare results.
Results: Sixty subjects had both eyes measured with each device for a total of 120 eyes. Subjects were categorized into 1 of 3 groups with 20 subjects each, 40 eyes in each group. Subjects in group A were wearers of overnight corneal reshaping, group B were soft lens wearers, and group C were noncontact lens wearers. Overall, the measures of axial length from IOLMaster and MMD were highly correlated (correlation=0.93, P<0.001, n=120). Similarly, measures within each group between the 2 methods were highly correlated: group A (correlation=0.94, P<0.0001, n=40), group B (correlation=0.90, P<0.0001, n=40), and group C (correlation=0.98, P<0.001, n=40). Results were highly correlated between the two devices. Data scatter plots and Bland-Altman plots were generated, showing that although there was good agreement between the methods, the MMD almost always measured the axial length smaller than the IOLMaster (median difference=0.21 mm, mean difference +/- SD=0.26 +/- 0.42 mm).
Conclusions: The MMD is a convenient, reliable, and portable device to measure axial length. It can be used to monitor axial length in patients over time.

• 出版日期2015-5