Abstract:

Objective To compare the accuracy and consistency between Lenstar LS900 and Tomey EM-3000 in measurement of central corneal thickness. Methods One hundred and seventy-two patients (188 eyes) with cataract were divided into four groups based on the axial length: group A (≥28 mm), group B (26 mm to 28 mm), group C (24 mm to 26 mm) and group D (＜24 mm). Central corneal thickness was measured by Lenstar LS900 and Tomey EM-3000 analyzer respectively, and the data were statistically analyzed. Results The mean central corneal thickness measured by Lenstar LS900 was (541.51±36.41) μm, that measured by Tomey EM3000 was (536.28±37.64) μm, and there were significant differences between them (P<0.01). Except for group D, there were significant differences between central corneal thickness measured by two methods in the other three groups (P<0.01). There was linear correlation between central corneal thickness measured by two methods (r=0.96, P<0.01). The 95% limits of agreement ranged between -13.9 μm and 24.2 μm, and 95.7% (180/188) fell in the limits. Conclusion The central corneal thickness measured by Lenstar LS900 is slightly larger than that measured by Tomey EM-3000, while there exists high correlation and good agreement between them, and both can be used in measurement of central corneal thickness. However, the measurements should be carefully evaluated in patients whose intraocular pressure must strictly be monitored.

Key words: central corneal thickness, Lenstar LS900, Tomey EM-3000