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Orbscan II underestimates corneal thickness post-LASIK
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In eyes that have undergone LASIK, the Orbscan II scanning slit topography “significantly underestimated” corneal thickness, according to researchers. Both ultrasonic pachymetry and non-contact specular microscopy tended to show an “excellent linear correlation,” the researchers noted.
K. Kawana and colleagues at the University of Tsukuba in Japan measured the corneal thickness in 203 eyes that had undergone LASIK for myopic correction. The Orbscan II (Bausch & Lomb), SP-2000P non-contact specular microscopy (Topcon) and ultrasonic pachymetry (Tomey) were used to measure the thickness in each eye.
Each of the devices gave significantly different corneal thickness readings (P < .0001). Corneal thicknesses measured via the Orbscan were significantly smaller than those of the noncontact specular microscopy (P < .001) and ultrasonic pachymetry (P < .0001). The value obtained with the Topcon was also significantly smaller than that taken with the ultrasonic pachymetry (P < .001), the study found.
Significant linear correlations existed between the scanning slit topography and non-contact specular microscopy, between the Topcon and Tomey devices and between the Tomey and Bausch & Lomb devices.
The study is published in the April issue of British Journal of Ophthalmology.