Abstract:

Objective    To compare the central corneal thickness measurements using pentacam，orbscanⅡand A-ultrasonic pachymeter in myopic eyes. Methods     Central corneal thickness was measured and analyzed with pentacam, orbscan II, and A-ultrasonics．Results     The mean central corneal thickness measured by pentacam，orbscanⅡ，and A-ultrasonics were (536.01±32.33) μm, (539.21±37.45)μm，and(535.39±31.46)μm，respectively. Significant difference was found between orbscanⅡ and pentacam or A-ultrasonic (P<0.001). No significant difference was found between pentacam and Aultrasonic(P=0.095). Positive relationships were found in the results of corneal thickness among the 3 methods．The correlation coefficient r of (orbscanpentacam)， (orbscan-A-ultrasonic), (pentacam-A-ultrasonic) were correpondinging 0.917，0.906，and  0.965. The regression equations were “orbscan(μm) = -30.699 +［1.0622 × pentacam(μm)］”, “orbscan(μm) =-38.599 + ［1.0792 × A-ultrasonic (μm)］”, and  “pentacam(μm) = 5.424 + ［0.9919 × A-ultrasonic (μm)］”. Conclusion    For central corneal thickness， pentacam is superior to A-ultrasonic， but  orbscan /pentacam and orbscan/A-ultrasonic are not substitutable for each other.

Key words: Corneal thickness； Myopia；  Pentacam; OrbscanⅡ； A-ultrasonic