Correlation between sulcus measurement for phakic posterior chamber implantable collamer lens by ultrasound biomicroscopy and white-to-white measurement by intraocular lens Master and Caliper

Background Proper measurement of white to white (WTW) is very important using both the Caliper and the optical biometry devices such as the intraocular lens (IOL) Master to reach an ideal size of implantable collamer lens (ICL). Objectives Assessment of the correlation between sulcus measurement for phakic posterior chamber ICL by ultrasound biomicroscopy (UBM) and WTW measurement by IOL Master and Caliper. Patients and methods This cross-sectional study included 30 patients with high myopia not eligible for Lasik and was prepared for ICL lens implantation at the Ophthalmology Department, Ain Shams University Hospitals, Cairo, Egypt. Preoperative measurements including visual acuity; intraocular pressure; fundus examination; horizontal and vertical sulcus-to-sulcus (STS) measurement of posterior chamber ICL using UBM; WTW measurement using Castroviejo Caliper and IOL Master were evaluated. Results There was an excellent agreement regarding each of the WTW mean using IOL Master and Caliper [intraclass correlation coefficient (ICC)=0.864; 95% confidence interval (CI): 0.715–0.935], the mean of vertical and horizontal STS by Dougherty and Kojiama (ICC=0.905; 95% CI: 0.800–0.955 and ICC=0.859; 95% CI: 0.705–0.933, respectively). Conclusion An excellent agreement between WTW measurements using a Caliper and IOL Master and vertical and horizontal UBM-STS was assessed by Daughtery and Kojima.