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Repeatability of biometry measured by three devices and its impact on predicted intraocular lens power
Naren Shetty1, Luci Kaweri, Ann Koshy
1From the Department of Cataract Surgery (N. Shetty, Kaweri), Department of Cornea and Refractive Surgery (Koshy, R. Shetty), Narayana Nethralaya, Bangalore, India; Department of Ophthalmology, Maastricht University Medical Center, Maastricht, the Netherlands (Nuijts); Imaging, Biomechanics and Mathematical Modeling Solutions Lab, Narayana Nethralaya Foundation, Bangalore, India (Sinha Roy).
Purpose:
To compare the repeatability of ocular biometry measured with the LENSTAR LS 900, IOLMaster 700, and Anterion and its impact on predicted intraocular lens (IOL) power.
Setting:
Tertiary eye-care facility in South India.
Design:
Prospective, observational, cross-sectional study.
Methods:
Eyes diagnosed with cataract had 3 consecutive scans on each biometers. The repeatability was assessed using the within-subject standard deviation (Sw), test-retest repeatability, and coefficient of variation (CoV). The agreement was evaluated with the intraclass correlation (ICC). The IOL power was calculated with the Barrett Universal II formula.
Results:
The study comprised 127 eyes of 76 patients. The repeatability of all parameters for a given device were excellent (ICC >0.9, low CoV and Sw). The agreement of the parameters between the biometers was very good (range from 0.93 to 0.99). The predicted IOL power differed statistically between the devices (P < .05), but the difference was clinically insignificant between the 3 biometers (ICC >0.99 for repeat calculation of IOL power).
Conclusions:
All the biometers included in the study had good to excellent repeatability of biometry parameters. The agreement of the predicted IOL power was excellent between the 3 optical biometers.
