Resumen de Assessment of differences in ocular morphometric measurements by using optical and applanation ultrasound biometry in the same eye.

I. Ribas, Juan Alberto Sanchis Gimeno, Isabel Asensio Romero, L. Alonso, Francisco Martínez Soriano

• Purpose of this work was to determine the differences in ocular axial length measurements carried out by one investigator using optical and ultrasound biometry on the same eye. In a prospective study, we measured the ocular axial length in 30 eyes of 30 diff e rent patients with the non-contact optical IOLMaster¿ (Zeiss H u m p h rey System, CA, USA) and immediately afterwards with the ultrasonic Compuscan A-B (Storz, St. Louis, MO, USA). One investigator took t h ree consecutive readings of the ocular axial length with both biometers; the means of these t h ree consecutive readings were the ocular axial length values used in the study. The mean age of the sample was 33.55±8.32 years (range, 21 to 54 years). 23.33% (7 eyes) of the biometric pro c ed u res were conducted in women and 76.66% (23 eyes) in men. A t-Test for paired data was used to confirm the diff e rences between the two meas u rement tools. P<0.05 was considered to be statistically significant. All measurements made with the IOLMaster¿ unit were higher than those obtained with the Compuscan unit. The IOLMaster¿ unit measurements were on average 0.38±0.20 mm higher than the Compuscan measurements (p<0.001). The mean ocular axial length was 23.82±2.18 mm as measured with the IOLMaster¿ and 23.43±2.14 mm with the Compuscan A-B. The minimum difference between optical and ultrasound biometry was 0.12 mm and maximum was 0.74 mm. Optical and ultrasound biometry are two efficient anatomical tools for study of ocular anatomy. However, all anatomists should take into account the differences between the optical and ultrasound results when carrying out anatomical ocular studies in vivo.