Lenstar LS900 vs EchoScan US-800: comparison between optical and ultrasound biometry with and without contact lenses and its relationship with other biometric parameters

BackgroundDue to the increasing use of contact lenses (CL) and the interest in ocular and body size relationships, this study aimed to compare measurements from two biometers (contact ultrasonic EchoScan US-800 and non-contact optical Lenstar LS900) with and without CL and to explore the relationship between ocular and body biometric parameters.Design and MethodsThis cross-sectional study measured ocular biometry using two biometers along with their body height and right foot length in 50 participants. Differences between biometry data from the two devices were compared and correlations between ocular and body biometric values were analyzed.ResultsAll parameters showed interbiometric differences (p & LE; 0.030), except crystalline lens thickness during CL wear (p = 0.159). Comparing measurements with and without CL, differences were observed in axial length (p < 0.001), vitreous length measured by optical biometer (p = 0.016), and anterior chamber depth by ultrasonic biometer (p < 0.016). Lens thickness remained unaffected (p & GE; 0.190). Body height and foot length were correlated with anterior chamber depth, vitreous length, and axial length (p & LE; 0.019, r & GE; 0.330). Most biometric parameters were correlated among them using both devices (p & LE; 0.037, r & GE; 0.296).ConclusionsThese biometers are not interchangeable and CL affects measurements. Body height and foot length correlate with ocular dimensions, and most ocular biometric values correlate positively.

Automated summary

This study compared measurements from two biometers (contact ultrasonic EchoScan US-800 and non-contact optical Lenstar LS900) with and without contact lenses, and explored the relationship between ocular and body biometric parameters. The results showed differences between the biometry data from the two devices, and wearing contact lenses affected the measurements. Body height and foot length were correlated with ocular dimensions, and most ocular biometric values were positively correlated.