A comparison of immersion and contact techniques for axial length measurement

A prospective study was conducted on 180 eyes to evaluate axial length measurements obtained with both contact and immersion techniques. Each eye was measured with the Ocuscan-DBR (contact), the Ocuscan-400 (immersion), and the Kretz 7200 MA (immersion) units. Axial length measurements obtained by the two methods were highly reproducible. Axial length measurements obtained with the contact technique were shorter than measurements obtained with the immersion technique by an average of 0.24 mm.