Optical biometry provides more repeatable and precise measurements of biometric parameters in highly myopic eyes, states a recent study.

, Division of Preventive Ophthalmology, Zhongshan Ophthalmic Center, Guangzhou, China, compiled a comparative evaluation on optical biometry (OLCR), partial coherence interferometry (PCI) applanation ultrasound biometry in highly myopic eyes.

Biometric measurements were recorded in patients with a spherical equivalence (SE) of -6.00 D or higher and an axial length (AL) of more than 25.0 mm. OLCRS was used to obtain AL and anterior chamber depth (ACD) and compared to the results obtained using PCI and applanation A-scan ultrasound. Bland-Altman analyses were used to evaluate repeatability.

The coefficient of variations (CoVs) for OLCR, PCI and applanation ultrasound were 0.06%, 0.07%, and 0.20%, respectively. ACD was recorded at 0.29 mm, 0.53 mm and 0.51 mm, respectively. Mean radius of corneal curvature was the most similar between OLCR and PCI, with a limit of agreement of 0.12 mm.

The AL and ACD measurements obtained by optical biometry were more precise and repeatable, compared to measurements obtained from applanation biometry.