Comparison of keratometry and white-to-white measurements obtained by Lenstar with those obtained by autokeratometry and corneal topography

Abstract Purpose To compare anterior eye segment measurements obtained using low optical coherence reflectometry (LENSTAR LS900, Haag-Streit), autokeratometry (RC-5000, Tomey) and corneal topography (Topolyzer, Wavelight). Methods In 46 healthy subjects, flat keratometry ( K f ), steep keratometry ( K s ), mean keratometry ( K m ) and white-to-white (WTW) distance were measured by Lenstar, Tomey RC-5000 and Topolyzer. Results K f and K m measurements of Lenstar were significantly steeper than Tomey RC-5000 (both p K f and K m measurements of Lenstar and Topolyzer, with a narrow 95% LoA. There were no significant differences between the K s measurements of Lenstar and Tomey RC-5000, and Lenstar and Topolyzer. A good agreement was found between them with 95% LoA of −0.40 to 0.56 D, and −0.56 to 0.64 D, respectively. WTW measurements with Lenstar were greater than those with Tomey RC-5000 and Topolyzer ( p  = 0.042, p Conclusions Generally good agreement was found between the Lenstar and Tomey RC-5000, Topolyzer for K and WTW measurements. In clinical practice, K and WTW measurements obtained by Lenstar and Tomey RC-5000, Topolyzer can be used interchangeably.